Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84fa295351434e9…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 13:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d06f8216c0c4d145786158b40355b54 SHA-1: 830784149520095c0fa892527476dabc0701f587 SHA-256: d84fa295351434e996d45ef81b9626d1a3e589e83ab1e3e9d8e9bbcb26e7a5ec
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting further PDF files. This suggests a multi-stage attack designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160945ae2af400---92771257287.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aed97982d---siwusaledejapetafa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084afe1cb2bc---zixewogiwosiwenatulogo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b0925a5a---revoxazogupemoxo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/35017191548.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/beponavoxiresit.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c24bd697f24---87543878610.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7f1f4418936e5b54d944f464caa07fe7/87641779706.pdfIn PDF document text
    • http://debden.org/userfiles/file/87592803034.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/vobeniba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kukodeberedexa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ac455cef---55999563592.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/58881932020.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/zitisetafuvamek.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c6604960---20160607250.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/kukagivepikosupurab.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/96464927842.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff084c55e---68271765306.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0e8r5ijmivfqrr5fhp5vcuiqls/xavozubagabodudifulonani.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/42a1f88132513d04452f9115e7c01a82/jawanifagi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1f5a9b8005f2b90a40918d528d594037/xedowaraxuxexofomodijasu.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/27530541559.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2188d5817---noseki.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b4b0a4d6fe49b04a8eba20ab6e2de1f1/jajilodoluwifokujimadub.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/o9rhdbdkhju2tu9ondg9mfhu5u/voduwizexigulurowav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=use+of+glycolPDF 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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 10076 bytes
SHA-256: 244243f7978477db54a59e56aa2f4c6dae05db7d6c92a4d91d4098d0f2a75bdd
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16984 bytes
SHA-256: 7063b9c100046c637fd70e918b6c6d0e3e0bde67b432ed296b2ae15c8df38726