Malicious PDF — malware analysis report

Static analysis result for SHA-256 772cd43422286694…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 11:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 024cb1c44a4b3d29c28f4af7fda70674 SHA-1: 0d35e9fd94c72732b56c6a0c4a289aea7194f1d2 SHA-256: 772cd43422286694480cf1e6a12f8396a9ddf2d90deb08ad78a1b6b4dc782b2a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and potentially malicious PDF files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfff03c16---15745499208.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/fc720bb4bff6ab9de7a972a3db3edb85/gimunazona.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a3aeb76c3eecb1aa0ebcf5bbbe785af/pitafigewo.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/vamifajuxena.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/sajigodifazux.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/wegozagubexenumag.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/84389919861.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ceb369189f037e88e49f4f3320a0fd0/87612491245.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc066ea74---sesaxigupefixigabi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a65ce0d94---nubasojunolaxowi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16103a0867ea2d---44122028090.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mudisedenitanemufub.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/k710oj9dc42kfel6okpljvh84v/gatudizotokeraran.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a72a8a85---51158271360.pdfIn PDF document text
    • https://mashura.co/userfiles/files/1064175128.pdfIn PDF document text
    • http://scsychem.com/upload/files/8819679647.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bbpe4d58o0rbthccvsim2ktfst/37756177526.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f30d504f---gekolepudibemunavawanid.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/kudonejimu.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/16495028270.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/38059171650.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/totejelugububakinowuzelam.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0bcdd283355cfdfc6606f0a8aad3b632/28400520540.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/27780621071.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/jajiwitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pirates+of+penzance+vocal+score+pdfPDF 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

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_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 19016 bytes
SHA-256: e4699f44e10c2703a81eb4dd94d5b14806656f74b315263b4af2e14039c21b71
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10740 bytes
SHA-256: 7cbbc85935ca3bdd2e86665342ebbceb3d1818cfab80d846b1cdb82e47504fc0

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