Malicious PDF — malware analysis report

Static analysis result for SHA-256 617f3fd5d6cc3b0f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 20:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2f3f7332aa504ff1f1d2914df705476 SHA-1: 5dd64b4ccc3174722a89e09a1c41f0090b61e97f SHA-256: 617f3fd5d6cc3b0f595f0abb04534f8824800b6b86743339ae7bcd9b1531f2a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • 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.
  • 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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/v0cck5kiputj77pe4bauvjqfiv/46285976009.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c2fc4fbf581421c486a052cf7ff7aa4d/62552471289.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/10752822274.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/32b692b5acf30ed58147e5c878d9b907/gotezu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075377fea98a---85541505315.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddb902ed0---sekevekemenevikeniluduvul.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/54741819135.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/341b4e5159c1e490d4f7b8f202ddf964/39906956333.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/volafozavuwuvurebofoda.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf1db8fc40---94429371606.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/533daaa9581a7d713953ccc49c05c38c/gulumorujemew.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a6ea4e79---zekug.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624230072todavenuvudevuxanuxun.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/44946077045.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nowogineferusabakotuwu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83b7fddca7---98571709820.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/mamogunibixajuliwinikev.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j2btajj9n3d44qmbfr4l2hd17l/joxuvatixazefetupero.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9b4f616f4ec405d09477ffb3e39b9e6b/63793130365.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30db31878---sugosaxotulezu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/derodizi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/812d72b2366d7ddc264c4b9c3c1b3395/bipudinup.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/gesisabodaxun.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/41251068275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=step+brother+having+sex+with+his+sisterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dcIn 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_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 17420 bytes
SHA-256: 8809890aa8b463eae7f6fd8e957fc70ae016bf48fa5c151621d4fd58036eb790
font_02_sfnt_off000142b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 10956 bytes
SHA-256: d978095c66d1bf4892d83dc2e1e1bd1b36ecac4fa8cd7272ac653b73c5a4cb36