Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ab8a6bb1989f61…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 22:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 579d40060511fa0b93e04036576caba5 SHA-1: bb62d4a9ea7163f2966d287212c8f7236f95a2e0 SHA-256: 50ab8a6bb1989f6126f555b87bb8cccc5637ec94ac399d42d9bfea6ac0eec260
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to execute malicious actions within a PDF. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084851e84a38---32337050306.pdf
    • https://benqmusicworkshop.com/fupload/file/28742222075.pdf
    • http://hongpakthai.com/ckfinder/userfiles/files/gusugavugimirexu.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5bd37ff9---70121800151.pdf
    • http://palazzodiaz.com/userfiles/files/51480190885.pdf
    • http://kingsauto-bar.com/js/upload/files/81062956674.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a406bd51c752430c5d89c7037534edc2/39348918916.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/3d60f0f9379bcc8ab7529a6549a94219/ludeguditawowurabowifali.pdf
    • https://alarrabnews.com/images/content/content/file/50673581007.pdf
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/75506945670.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t8btql7121tc599a9a0srhb1u0/mesidozivawofo.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb163cc9c---taposegu.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2313702b---jatudidukipiwufobene.pdf
    • https://arrayamed.com/userfiles/file/3216198027.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/70f1fba0bb716bb1e2e5fc53407cab10/73155191705.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2da3bb7e7a1186a9eabd091be594f413/rikawuvuxabetedulevome.pdf
    • http://zoldjogsi.hu/uploads/files/2559563385.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d19ae60d7---13144581059.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7aa8abaf0---sodogomelif.pdf
    • http://axiomestates.com/userfiles/file/jijalalibukimit.pdf
    • https://businesslife.com/content/file/90056256583.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0ad85f547092104a5e98df65131e19cc/27605994272.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/56013711456.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=invisible+man+important+quotes
    • http://e1pl2.nazwa.pl/busy/fotki/file/gotet.pdf
    • 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_off0000fc39.bin
da8f659ee0cb82cc3e9b0cef5690cc7a75f14fccb268128d67b9e4cdc898d517
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 17652 bytes
font_01_sfnt_off00012a6a.bin
e238b1dc354622b7968e06c7cd81cfaa72530c42ce0ded528a020c0acf2831f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 10816 bytes
font_02_sfnt_off0001431d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431D 16792 bytes