Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b807cf82b196ca…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 06:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab6f0d80b2e3fa55837c49cc1747bab4 SHA-1: 74f77624537e14d23e9493bf8dd78af63c069222 SHA-256: 22b807cf82b196ca2c031c2380d5d5e49a34c16087312e6861c8adc750c6f911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://chiari-web.com/ckfinder/optimist/files/83621166099.pdf In PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28134156354.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d02f20f73---410555328.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/bilafino.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7aecaace32ad9efa3724440270b1f3b9/25079098254.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/kaselojutogowo.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/sowuludotepizamulajija.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/85770572607.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dd1a41faf2796d7bf413325ed3826e4a/63809577846.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/52455452589.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipezakegomasuzinuwudowum.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9cade5898---11538915506.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/18d27143de3a4bfcf69aefaa55f834c7/botezomilurixavezat.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddbb4e6f3f---bumemezuvikivuze.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/40666442390.pdfIn PDF document text
    • http://temple.mo/userfiles/file/34746513728.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/ruladufekasobenirimejozod.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/winuve.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/6224782888.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/58456161337.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/80728124336.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/36527681688.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/31878305618.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607697ab82508---19574489966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=senor+wooly+puedo+ir+al+bano+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 18124 bytes
SHA-256: bf419f5d6d74867f8d9e3230b8251218eb9c29d58c16559d66a0b57d14bf50a4
font_01_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 20192 bytes
SHA-256: 873f88256068ed7d04d6fadb66da00c4625bb9d4c108510b1e75dd03129114db
font_03_sfnt_off00015e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E43 11096 bytes
SHA-256: 22b0dc8f20533ddcbc52b1a0af3ab4b60a10853a0b81e4b04da147db13b778da

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