Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba28f7d26c508bd3…

MALICIOUS

PDF

91.7 KB Created: 2021-08-20 09:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bb6723d973888962b37c349d6968e97c SHA-1: cdb4b163238892335a46c73a446b755cf7863f1e SHA-256: ba28f7d26c508bd3f08c682b0ef794575d8604cf712f32556e865c405bf276cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=instruction+manual+for+armitron+pro+sport+watch PDF link annotation
    • http://somsit.com/ckfinder/userfiles/files/49348870022.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b022b395c9---39515912266.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/pofurulizaxiziloxuwizisu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/62771318014.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5c7665e3d2---gewagune.pdfIn PDF document text
    • http://www.moyekolodin.com/files/47247711124.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062334419_285963076.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16073d41d91a68---pevavidapogubuwupej.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ef12d24b4d16e80bba05dc5ca1395f0/nunukezupezitulu.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/zemigafetuk.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/qemb4b1j5l77triomrolnue922/sesesugiburasogexuj.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a5b30ad81---88448575194.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/93251795092.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/rojiledutuzifejeseno.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/jugefutub.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/pezemubanagobipabijuper.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/4748552789.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7763e0ef1fdabc2f7206f52e526b03a8/43150458886.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/salabelumomufutexozomapa.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/daxonaxokilobesis.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8g4jk8hln3elvatp7jk9kr6kf2/korofifanedajan.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/vimotuxefewiwaj.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/22157819431.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/kiposizuvekovoperireziw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160814dfa02bda---xujiduz.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/bujabusozineziwatuguma.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 10752 bytes
SHA-256: dbcdc5018df113ebf5d295c8e388300ff07dc231f792d0378148b8a9941f9089
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 14256 bytes
SHA-256: c9c470dd39801d70e7ce95d3ccbcab71d9959aa550f43dfb79c27630069eb44f
font_03_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16924 bytes
SHA-256: 886b25dfb7752e2e67369c317b184bd3c8367e94523c995dc67209bfbdda5f4a

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