Malicious PDF — malware analysis report

Static analysis result for SHA-256 add22fe612584ffd…

MALICIOUS

PDF

91.8 KB Created: 2021-08-05 08:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a93a037a7665d5502203e09d0e58fec SHA-1: dc2eca653bde6baf185baf17e475376d13ec9059 SHA-256: add22fe612584ffd1f8730737d36f6a32b4180e86f08f86da2a9a403863603a2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm used for phishing or redirecting to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://pogservice.ru/userfiles/file/doberiwatosikekumutupe.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/meb7mnu80qc79omcrs8lk6508d/17973972715.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cd77515b---vinokixibowilabiwijosuxa.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qq4gkm8l53fc8hrf9ltesm17bi/61303322607.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/burawewutewimerosokobid.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8b92e786---gipunipirigavasutixol.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/vugakuxisaz.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/vitewetibonokejudob.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4d50233342f9f1b48fe85b0f6a206a85/61171879118.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/31344915409.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/gelano.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/84612210721.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0313edac2---subipovogovewili.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096efc8d97e9---visalanunovixeb.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/78369538682.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9993372068---rubov.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/99987730564.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5fcc1a6bfd23eb1bbd09d424e277e81e/neretigov.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429064350132397.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/poxaxi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d2c89453c6b01949056bff3309a92530/nuwaxowukufenupulijove.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1608cd1e318317e724ffc6ae32fff33e/65132590863.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i8ebs2rkksniko0cplsqgp2ifk/giremegexatakigelu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6ae9nqcvgv57i12uq8c43o4s17/kipuduxijasutep.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/lekobezazuzi.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/34115770695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%D0%BC%D0%B3%D0%BB%D1%83+%D0%BA%D0%BE%D0%BB%D0%BB%D0%B5%D0%B4%D0%B6+%D0%BF%D1%80%D0%BE%D1%85%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5+%D0%B1%D0%B0%D0%BB%D0%BB%D1%8B+2019PDF 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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 11296 bytes
SHA-256: 32d5c8564a9bdf04183c01557e259f2765b96a8fb619631eea6fd307d20f558a
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 21132 bytes
SHA-256: 9da3d4e302ca49f618f78ce1250349bbd67b8cc82ba0acf848f0c28c962b403f