Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3cc188b8f5f740…

MALICIOUS

PDF

175.5 KB Created: 2021-06-21 07:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 647fd0529b5b1ac5fdeb39d200faa0f7 SHA-1: c475ec899c9332c21a7e5a058cae9500fc37df2e SHA-256: ca3cc188b8f5f740abc1a4277725961bb10959ff4bac957dc791021398d4463e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://pensiunea-escape.ro/ckfinder/userfiles/files/wokabupilaxasu.pdf In PDF document text
    • http://ldbell1965.net/clients/85689/File/pavajarapuga.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ddbdfccf5fdb04775a3d4d470741deb/wabazanidejumepitoxixob.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210609_5CBABB0955D65C22.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/67094580028.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b539b456a3---87447928298.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622894660.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg5uj47ln2aq4gokodbtu94k34/xufozive.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/4413485945.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pavamoxuwiwojunulixewa.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/kikugonojupetabavisof.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c880d1a4cb---79632596649.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/44ce9c3d8245326997e4343500dd5c1f/menitotugosogapalenujetu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/nomebogekexes.pdfIn PDF document text
    • http://bjjiffy.com/upload/57261724237.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/4732284650.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912be1ebe6e---nozevakudaxarukigekugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+pirate+bay+proxy+indiaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C4B 5096 bytes
SHA-256: cab579dbb704ccc7dd0e3aa9d5d14c65369d5e4b978639a1e0b77c890a8dd63b
font_01_sfnt_off00027d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D99 16672 bytes
SHA-256: 14157cba8519d9cb7a138f01a76cb491ffd63d240892a0c5797bbe60d79c8208