Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0973e9b92080dc…

MALICIOUS

PDF

106.9 KB Created: 2021-06-28 08:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9db3897bd5f8cdeb034db0b230449b15 SHA-1: f7be65c6f89d576b54b3dc0c89999299b0a92561 SHA-256: 4c0973e9b92080dc46866ef525b9f6c4903b2894045100a239d792c11e278de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into clicking and potentially downloading further malicious content or submitting sensitive information. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=best+engineer+in+the+world PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ntnfj0mkcj26dn6h7ed915ngb9/4034872104.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/251n3i0gkm57nfutj7lhpvstgv/robudozuwawamepikomewop.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6a4da1c9bf9a95b72741251f587076b8/fazubudalaloduw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1038f91b00f7750807689bde214141c7/xakowunukowalan.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974191c7232---93771681762.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/fodavafozan.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095d166ea654---52525341538.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/uit38k8jbou8mptlkl57esvqc5/79567212857.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210616163702.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e3340944---88266942699.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xozika.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26173dcba---45979752724.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gabamateto.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c60f600139a---47879764031.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/75ab44039565f6406ade5657ff271acf/12975512157.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lrl17m6r9q10565f3uot8frdtg/xitugelevifamosetako.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/96026300356.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01b38e5dd---12851743520.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f0p2assh4tfjvd1pfc4dnfufg6/tapelorigibamolirebebaki.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/45640408842.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0118df694d22f00d16761e24489baa0f/33663292745.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ede297fda---wajum.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/tujefifekugebo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608711c62967c---kokalavixanira.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14173 17276 bytes
SHA-256: ecef69569005c86fa7af3a39890a5f79620367447790c4624fb943c6454c7f2b
font_01_sfnt_off00016e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E83 10504 bytes
SHA-256: bafb88a893d84ee4f44d533f75304159e58955e23a157f65a9003b92f28d3754
font_02_sfnt_off00018635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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