Malicious PDF — malware analysis report

Static analysis result for SHA-256 260efd3761b3a876…

MALICIOUS

PDF

94.3 KB Created: 2021-06-30 10:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b442b42b197c8eab791c35331d670707 SHA-1: 77a7ad51923c9e08955f11430cc2b55f1ffb0b98 SHA-256: 260efd3761b3a876b0140fe051456778056e47817af5c0c3962fbcc48bb008bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The PDF structure and embedded URLs are consistent with phishing lures.

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 https://inwebjor.ru/uplcv?utm_term=addition+story+sums+for+class+3
    • http://zae.me/datafiles/file/70898383933.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0fdcaa260---31048326620.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789bf39605a---besizanorakiropodigatow.pdf
    • http://vekosgroup.ru/userfiles/file/zadujiwewulo.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6d17a4ed---paximalenugoji.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/o5o12kf7m7i9nj7u8l0mjrhfv1/rixakobugukofip.pdf
    • http://diamondsnspurs.com/clients/12200/File/96202203960.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12e0876c5---lepufegetenapojamiluvugan.pdf
    • http://hayatteknoloji.com/webimage/file/63295683352.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8hm3g9p350j35lt7p0ktm0n400/74608174460.pdf
    • http://artechq8.com/beta/uploads/files/ribulafe.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71a63cf01---89565978899.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a134744d430---38401222628.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bd238d46be4---95992449446.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609786078cdfa---44275655977.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025275e7cb---83199942831.pdf
    • http://kleiberit.ru/files/file/91940272491.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5db60134c2783b61a99117c90e1fb812/44001797885.pdf
    • http://alituncer.com/userfiles/file/sonowajaj.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55975cfc3---37083930583.pdf
    • https://securitydm.rs/slicice/file/wiwanonutewuvaxidaxerigex.pdf
    • https://guclupin.com/calisma2/files/uploads/sojiwegitobosorulomo.pdf
    • http://anandamsanyal.com/userfiles/file/56902942002.pdf
    • 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_off000109bc.bin
583a271d83e1deba5279443c1c0495fc9671c71ec5465a664c359607b7f56506
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10872 bytes
font_01_sfnt_off000122f0.bin
82f58a86e4dc4a52a77d0e987fb0826feca2e72f45ca385c5b8438d7ca5d1046
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 19208 bytes
font_02_sfnt_off000153e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153E9 16792 bytes