Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c83233e1b3e723…

MALICIOUS

PDF

89.3 KB Created: 2021-08-30 05:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c5aa3f454bcea6040f5eb387f33b9e9d SHA-1: bd0be301722f8e721bb64b8b153fea7ddd471bc9 SHA-256: 71c83233e1b3e723e54163fc810af3e401e1d326afb5e3c9fee665d24063ef97
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure and numerous URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cf02520db1c---37320381233.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160948152e6bdf---vewudukirub.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90bc025fa---21087278022.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/54704201210.pdfIn PDF document text
    • https://coluer.ir/documents/file/71717492032.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/91422365873.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kazidafufalutuguxidotibe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/omo3r9ja2tpsc54cm24unk8kce/nelirefenetaba.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/24464968133.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2b5b6b830c7378e6863411db5e8f3593/xavoralenubopejovum.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/11712803284.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uc63ovq7umf21cutnmpt6diop6/tuxatujomawedukutu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3e8fojglhhoqti2t4tr2j7ks3o/siganalasoxinanabojelo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/lamuken.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/bexasogukesujuguvebi.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/puwidevera.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/fupamudirekoxeza.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872904b31ee---47540088616.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fc519df53f7f51d13fefc39f79221942/46212677320.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c160a17da45---lonedisirexowo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1610e92a0709a5---23777104628.pdfPDF link annotation
    • http://myucpb.com/userfiles/file/5334435593.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/lipoti.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/252928139bd687053431b2a02c0a6f2a/92814344418.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/18932927267.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce891293bf---gexerepo.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/runugunodejevafefefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=word+that+means+to+ruin+someone+reputationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10704 bytes
SHA-256: c2c0dae11351f1265d882f2466fc31de63c60386ef75bcb389606ec08bb75e5f
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 17332 bytes
SHA-256: f1fde7c030a198589960327ed62aabaa1c3e265ed213c4e0ec7c90e78dd1b87f
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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