Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea21c5590d4639f…

MALICIOUS

PDF

93.2 KB Created: 2021-07-06 03:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 311af63f6f90d74234ba190247ee3005 SHA-1: 66965a8ff6c596513fefc37cbbafc190fe35af1e SHA-256: 8ea21c5590d4639f0b7d0d87bd9b93548eb7bf0bacbe9401b74a40c49762e73e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d210a03007---88758546277.pdf In PDF document text
    • http://j1medical.com/uploaded/file/72777168506.pdfIn PDF document text
    • http://holzbau-napetschnig.at/jalotoneje.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210614_055318.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e2bed1a4---naweturur.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vm8950nohm6k6s94tkdd0jlpi4/zejobus.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803ac0b6b33---1388638359.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/88559704515.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a251da64b86---66005576567.pdfIn PDF document text
    • https://termocasasrl.com/file/wadexamitud.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee637e4c4---fopuzezufepisoxogawu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4e69814c7024d8fecd62345c24ec52c4/zokovumutopopabijobefozoz.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/gugegidikoloxizuxokok.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/zozesutipuvevazu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0763b1906dfb9c9d87b19932f53a4e57/66305522436.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/davijejikekezuwod.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfaeede3b---47443823250.pdfIn PDF document text
    • http://jucal.es/images/file/momolow.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/95988115563.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/svlaog1j8qo5pg7fjqnu5ti0du/41381816811.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e89f808cf649cd14716305f0268a69d3/saruruk.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080872ad5c17---57353345370.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3idvjd67bpp70c2v9nvksktr8b/57971588329.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/jitifowovekova.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/96499945668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+use+airpods+for+androidPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10480 bytes
SHA-256: 3dc8461ee1b78ae702bdba5cfa7d4fcf77974ae117c945edfb56b3eb9dd32884
font_01_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 17664 bytes
SHA-256: 477280ff30af293ee8d1765f43fc68da298b94eb303aa704f9bb8c25cd8f43a8
font_02_sfnt_off00014f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1