Malicious PDF — malware analysis report

Static analysis result for SHA-256 578a4bf9a1186603…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 07:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffcdd95e9a0f8733b40e1fd01930fe0a SHA-1: 072a31f0c05f43d152de34f04dbddc6b7bbaff56 SHA-256: 578a4bf9a1186603e7a2150da1076d40d639b21d211401963e75192e96e7809f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm on compromised sites is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094ec643a1---dojatuvusegisiwa.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/e3457cd689a0c260587e2fe97d41d458/jizajoj.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcj00r49f540ieuon3oo3ugkeu/rudiwukaruku.pdf
    • https://vgi-vn.vn/app/webroot/img/files/bifalubogal.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac82ce5ccd---paletesopezoxobakasajuza.pdf
    • https://dodomacnosti.net/data/file/voxal.pdf
    • http://ezibra.pl/upload//file/13594041598.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/18874043482.pdf
    • http://sjhrz.com/images/upload/File/57649538774.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/76e23878e1a308d5285b537224580556/wujurigezanegal.pdf
    • http://e-district.org/userfiles/file/42635119436.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892def03a06---98202840716.pdf
    • http://shqinze.net/admin/upimg/file///40696417060.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607029b74b073---mibatubew.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977313006da---mowezerak.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4d06a627d00b19ebdaa4b8102be204b/dabinixunivi.pdf
    • https://ideylia.fr/uploads/file/jagerugidakovexixugi.pdf
    • http://n2nnetworks.com/files/others/xewisa.pdf
    • https://ctapigroup3.com/contents//files/biduw.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6a0e649f---xumevolukanetulilujeku.pdf
    • http://badaranquehablar.com/userfiles/files/rejuda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+real+and+complex+zeros
    • 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_off0000e650.bin
e0567c01d079aa823da0cedb3902a0667a3b89a9f4318cd4f3edbca9d1ea4172
pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 11020 bytes
font_01_sfnt_off0000ffee.bin
c37803ba9368cfe5939e756edd33a14fd2dc95717220756886cb5a7507cd780b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 17532 bytes
font_02_sfnt_off00012db3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 16792 bytes