Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac69fe3a12d8f2c…

MALICIOUS

PDF

92.8 KB Created: 2021-07-22 10:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 804b479170ecd71e5855ad6341ff0ca3 SHA-1: 235cd82aacd0792ab71e37dc42674617c3c1f49a SHA-256: 4ac69fe3a12d8f2c63ef56f81e0724f534b4dde15deba9f5266d39db37ed02f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13a72cb98---54011447289.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/qut457m9t1rklsql7a1m24rbah/nigokotukofamufetijazore.pdf
    • http://biancoacolori.it/userfiles/files/74931083475.pdf
    • https://aakritidigitals.com/userfiles/files/56442147377.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad30871ef0---70577623039.pdf
    • https://ktmcollege.org/public_html/userfiles/file/fabobirewukimefati.pdf
    • https://edusfera.pl/upload/file/dajojixatipave.pdf
    • http://icmasistemas.com/userfiles/files/98733094192.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1ecgkvt20tj8nmv71tl2j3p2o5/rosozapokifepug.pdf
    • http://www.pattyn360.com/upload/forum/files/39817444345.pdf
    • http://anandtouristcorporation.com/uploads/xesusejupudakid.pdf
    • https://daismene.it/file/17288628914.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076628e7d74e---demakoxivalufovupipovo.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4b4b1cf11f3ccd3d34db09993f77fc9e/20972571760.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f8f5593bcc406bd15e36cf976d13c194/makosabuvisuvenox.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/bo4ho9drs5vpu5sis4v68pbabn/86739990323.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e9c89902d---93106185179.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-10/20210510095722476631.pdf
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/78628437364.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fe0e9b8c9677cb5296483a405fb4e9ef/92902558967.pdf
    • http://banphimchuot.com/userfiles/file/tikag.pdf
    • https://europartner2.pl/uploads/38753353424.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba111422c8---82579477667.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+we+find+mass+number
    • 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_off000106f4.bin
e4928939dda9517b818ba644925dfed3836864616f2f7013156e91a908b67fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 10688 bytes
font_01_sfnt_off00011f75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
font_02_sfnt_off00013787.bin
78ef9bf7fe2b71ddae0ee4001656576161769b7bd85e8121d1781f7a41ee7680
pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 16868 bytes