Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb854726da570bf2…

MALICIOUS

PDF

101.5 KB Created: 2021-07-15 16:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da8b59d17274794fdab21db3b51a0ad6 SHA-1: 9ec6da88891bdfe9608b704c9a95ee5d39aa81a4 SHA-256: fb854726da570bf21e8522d622df6ed93ef914abef3fa03cb0ca6db59141c731
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, many of which point to external websites hosting further PDF files or potentially malicious content. The presence of a raw IP address in one of the URIs and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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://rebizplus.com/userfiles/file/45116513746.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3aaa7eb2e---97442320944.pdf
    • http://taiwanglassgroup.cn/userfiles/file/83292771243.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ee920cdea35---47575904642.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085813cce050---95381427721.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a41c96fd5bf2cdd483efe50ba73967e2/jupitodobavepojuvunali.pdf
    • http://evolutionchonburi.com/userfiles/files/pefitokevujelowunawaluda.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0271f9749011e120ee79e1ac02301880/29868786174.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/02ouapviblmghd348g27uiavde/73724794460.pdf
    • http://files.ibiza-ferien.de/file/18630089030.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609003c212fab---siluzifejozakabum.pdf
    • http://studiomalpocher.it/userfiles/files/20072831331.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ca74b38e---damanurolezodozi.pdf
    • http://blpest.com/UserFiles/file/21968637357.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/i76oje3e9r15esfoabj1dshif5/riforoxiwapotuvafawewa.pdf
    • http://jevades.com/aircraft/fckimages/file/93239254618.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c13a2de2---79015749848.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/989355b6a8552da2fe31feb5a7da8a28/42427433699.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8661d757---770624882.pdf
    • http://www.aportecnica.com/imagenes/editor/file/kelip.pdf
    • https://foundryindia.org/userfiles/file/vemun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+pull+strategy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 16792 bytes
font_01_sfnt_off00014358.bin
479c83831cf8c9154363cc5166c094469012ac85c9152e4d37ddfc19b4ed6c81
pdf-font-stream PDF embedded font (sfnt) at offset 0x14358 10304 bytes
font_02_sfnt_off00015acf.bin
bc4525f013183fc088543d6b21d58a975e6cf9b4f5249b96e78e43029525772c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACF 17588 bytes