Malicious PDF — malware analysis report

Static analysis result for SHA-256 8089a33a010a1e77…

MALICIOUS

PDF

90.9 KB Created: 2021-08-11 23:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d88f15b6d9c58e5ffd7d8ffabb69abd5 SHA-1: f689b0ba382cf3fbfbef63115697e85002d50572 SHA-256: 8089a33a010a1e770c1b33b2b6372df72cd7464ca04fd0c9d0941607c9aeaf99
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded links, some of which point to compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The presence of urgency and invoice lures further supports this, indicating the document is designed to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a9f574ce9d2539e3f8aa599af0a61d18/81360982231.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/kr7rp0a2fuktvk1kgbf1fn2cc7/88055065637.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lojoso.pdfIn PDF document text
    • https://tavio.ru/files/file/wimalen.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/84375000136.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e05d866c---52199432775.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vifexebugopikojuse.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/tavagigiwafubimedejov.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/61053564205.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9c7067c4eed00fc81ac1817f5a04d422/27774654639.pdfIn PDF document text
    • http://kelvista.lt/images/files/97826452124.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/vilogaruziwasegizil.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/38035204557.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/131e169c69929ea7aebc8917d4c819f3/fawizewevupijuzogojejale.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/dojeg.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2gbcl8ugbt3l8fmtoiv6qlm0i1/9474655570.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/rovifeniduj.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd501321e5b---dotano.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/82806561627.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zegupijegujalemagu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb04d5e007---77003540754.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/24433876193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=beeman+sportsman+rs2+series+.22PDF 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_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 17880 bytes
SHA-256: 42f16d8e301109bc57b8dd54ca3e2bca93b0dc2998f2609a7cb33b161a5e3743
font_01_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14549 10604 bytes
SHA-256: 280c067d2c5c6585d3af409d8e0e5ea244794c02d061d652f65e3963435f0338

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