Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e72aaadf935e62…

MALICIOUS

PDF

87.1 KB Created: 2021-08-09 00:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e121d90b9fa5037785cb5fc32bb24bb SHA-1: 294785a8496e6f370016b6722d08a1aa804a2406 SHA-256: f2e72aaadf935e625ff190f51170e4027e49278d789de3063bd2f99d811183d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9f0e271f8---gebewogidufizukotumen.pdf In PDF document text
    • https://morabia.fi/images/file/nijivozabipo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/90517065802.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/wotolejuxugi.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/36326535824.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a607990d---64650156423.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/64802218262.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvlknaesjti7kjdgnm7rqevshb/71122441793.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/024e9bab2d2caca242d20c9ebed3da3c/58937026747.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/xabifipadasamekuwigosib.pdfIn PDF document text
    • https://alutat.com/data/file/tomijemelij.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b681e42d4a---95743926157.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026b080067b---sukelilomufalojekeriv.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/85868419870.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/jezowesulesoledutasexemo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4b967t6n7nq1rvgo49pob8hfq3/5015030515.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff01cb3caac---77577680986.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/xopedabek.pdfIn PDF document text
    • http://ligneus.hu/upload/file/77984641931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vista+tension+pole+shower+caddy+instructionsPDF 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_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 17180 bytes
SHA-256: 29de8dbd6f7bff0c6042e1d48915c17b78f409acec8f97ab2e308d249e0fefe3
font_01_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 10880 bytes
SHA-256: 2b9b134ed4414f7055cb8bf74121ca95fa96e8378b98a9ed6dbfdc59274b8903