Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a230eccdfc5bbf5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 02:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcec0e790940b2c9a67b76c76223ac02 SHA-1: 363a8d9d0ec561b2a9b8cabb0d2df7a37301907b SHA-256: 2a230eccdfc5bbf5178ba14cd52228de46fa4fbf738bdbeda33d3dd5e307aa39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://artesapanaderia.xyz/aym_image/files/30758039457.pdf In PDF document text
    • https://airshow-bg.com/file/lipadikobarulilejujimuj.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zugawukaj.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/19802603539.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/zenif.pdfIn PDF document text
    • http://vucert.vn/uploads/files/rolobubilaraleweb.pdfIn PDF document text
    • https://grandegroup.net/files/55641179159.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/13389549500.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142dbf9ea934---nosise.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/5822589657.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zadogupixivoketelifenav.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/laritowawogi.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://streetnn.ru/data/upload/ck/files/teredelu.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/32180944227.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/20e28cfbfe543160daa4e6744c8b7946/16149269049.pdfIn PDF document text
    • http://kccmaul.com/files/files/41409993695.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161358f3c3cedb---takonox.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/rixopivawazewijo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133c51f9e250---35104801064.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/88874026456.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/82147462885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fear+the+walking+dead+torrentPDF 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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 10516 bytes
SHA-256: 8ff5e3ee74eaeec26d2ffb177dd9fdc21efaab8377e49d3874a5e1f1a89fe038
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 17392 bytes
SHA-256: 65eaaea7870f6aa1727660d3d798486fa704696fa3ffd0e25656b758efe6bcda
font_02_sfnt_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1