Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb584dd4cc4bac9…

MALICIOUS

PDF

89.6 KB Created: 2021-07-08 02:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7f0316266add1b0a5303ac37ed1f42 SHA-1: c8b4b8f7361d0f616c67b62235b1ec2f1d5e90ea SHA-256: cbb584dd4cc4bac9e7ed90508f2938c7f929837e03a54d660325d2bc4d09c4a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/51127bdd301fb91701bc3adfbb476f99/38255523597.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bade83920c6---risezujulataxewiwu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/90ac4694f27ee2b09c8d237ca6c7365f/74678367940.pdf
    • http://daydala.com/userfiles/file/73648381131.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cb2510e00192d2d345766ac34c06b6d3/33691875705.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l33i33o8lg1e6ql9v82cuir87a/53435479557.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/90a50cc4c6bc0bed294c7f28af7b5e1d/37444673319.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/96130393015.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3958e42e---34654557920.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d941dc70---pevalogukasaborigigo.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4141ede8086df06afc8dedc9aecd504f/ziwul.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/l5l3mtrpgd164bidiums678m0r/95299274600.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/886152daf02e8d847b82736cab64c083/87044495622.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/55a0b9e1aebc5d81a68854d53ee7fc1a/rolipewelo.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e4c87775---88939005273.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kkd89kegt5g8emishhth176eg0/58003396359.pdf
    • http://kopdesign.nl/userfiles/file/vopaguveke.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cbddc3ce2c1f01bbae57a4694e01ed07/bevevaladi.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ed1ea82iolqj7gh1ihuv5s26ff/kegufufedadisemob.pdf
    • http://birnagarcollege.in/userfiles/file/zekiv.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086576838056---73370385676.pdf
    • http://asirakademi.com/resimler/files/pasutexukefal.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd7234288---82261616180.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a466517e6d4---nitojulogosatiwikitobobu.pdf
    • http://palletgoanloi.com/img-dn/files/pujafivapiveraf.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad479a5d3---4721547791.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+process+of+gas+changing+into+liquid+called
    • 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_off0000f8bb.bin
2aa809dd5d899106dc6009bc1d77c6a3bf9584a55037c5be4782d53711f2588f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 17760 bytes
font_01_sfnt_off000126e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16792 bytes
font_02_sfnt_off00013ef7.bin
e631a27498599ae683819ccaab4b2c44e0abe63cbdad7a5487aea1e98338a83d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF7 11140 bytes