Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50db1b6d98c640e…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 06:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d95f97518e942925ce1c271973eb0e28 SHA-1: 8d8411185bd40d75c823a636fa4251c7f6318cb2 SHA-256: d50db1b6d98c640ecb6f957d8c4808070a756497ce5d993f6cb84b72d266a68d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/p6av4us7n3a365l8rrebh3ni70/94101339563.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4734c139---wuzujalajowiwudomi.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/98281996047.pdf
    • http://snotlicker.com/clients/10243/File/27078372166.pdf
    • https://tolgyesvolgy.hu/userfiles/file/69188440284.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d261a76966---13512762714.pdf
    • http://hotelstrack.com/bot/ckfinder/uf/files/zuwiwedutapumizafuw.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b959deb4---rakupegiwonuki.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b43e3fcbcd118efb82b527a279b391e2/47974553144.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077186f7a940---kowuredagoxivavuliwisu.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9a636528ac8358db4c2a69c7a67e6cad/xerinuzegazerowi.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8b322c6168fbea220226d7c82c900c69/63751513545.pdf
    • http://boathousebrokerage.com/userfiles/file/vuvafa.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ie1v4ougmqp9ig78fbfmglhgrd/96671464287.pdf
    • https://lienlacanien.com/img_pages/file/xatolurupiketujudub.pdf
    • https://lawina-radom.pl/files/file/bavozasofukokufon.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dce15ec0a---23014819851.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/warobuxasuxugurafiwudeta.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/49034726770.pdf
    • http://chataphan.com/file_media/file_image/file/rimuzilogovok.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/vexuvij.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836899c05c5---dupajuwigetem.pdf
    • http://blackivy.pl/userfiles/file/74824890290.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b119e82e083f80e4e219b9bae632e31/94171128694.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+would+you+change+about+your+job+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b86.bin
2f42d64f9e92780d6eab03bbd517398f776b9089426bd7acc427f41a010b5da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16984 bytes
font_01_sfnt_off00013781.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 16792 bytes
font_02_sfnt_off00014f98.bin
524e7380bdd7612ad3d45ff771bf8e6e38d7b2ecb30eedd1901b78265ec70af8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 11120 bytes