Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb220b8ea3d1ed2c…

MALICIOUS

PDF

89.1 KB Created: 2021-08-11 10:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa0addd48bbb7ccc668055467fa590c0 SHA-1: 2101d1d5a31f72de14b55bd3da305df745f376d5 SHA-256: cb220b8ea3d1ed2c4d8a102bbd91de435c70736a04243bfffe29f7d34234976c
216 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of 'cMD' in the document text, alongside the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, points towards an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e122d43f---69039838880.pdf In PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/36088375566.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e003be7c---defuwereg.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcca08a7d---zivifaresikizokela.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/zuvireru.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/809c922f3bfa5418f5e1f0d304ac7517/43936600412.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/18383551611.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e3ce2d09c---nawazale.pdfPDF link annotation
    • http://www.deco-interieure.com/userfiles/file/sujogubozufuxolugev.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160864d4ddc0fe---76330179921.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ha0uq3dj39brglq8ieh4g4f591/tuzopupud.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bbb6cc8d4---2399748376.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161118bba6efa3---5054403749.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2f5ceb64963e2f4e362f203d9439f5a/46082359088.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb3dc944b---xofezorowagufageke.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/456996710.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/2140312598.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j2n4coorf1t7812klfaa1j1su7/21945726536.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/tiridemeju.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/zobopatobev.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/70196389613.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/28786561725.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/71624615796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=house+renovation+budget+spreadsheet+ukPDF 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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 11012 bytes
SHA-256: 13b1bd310fc34ccfa06b758cfe4a2ef61c3a4dafe1c465df8401da66e5730e5c
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 17824 bytes
SHA-256: d3ee6f6bb183ea02947988c4c1e6b251e0205555cdf5d2e49633c7cc1671cef0

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