Malicious PDF — malware analysis report

Static analysis result for SHA-256 2905876e60373eb4…

MALICIOUS

PDF

88.5 KB Created: 2021-07-21 05:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a01b31166a2af393f9c18a406f9c01b2 SHA-1: 453962b4bd31e781aac4cbe86b5339b98272dc94 SHA-256: 2905876e60373eb424798f0e1a4080eff906e395b2ebfab4182aee8902ab3151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and link farm heuristics points towards an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608849446f2a9---8736023699.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/up45g6jgdr13s6rn3rjrqgpn68/majemaravevurefaxojot.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8d6832d4---19619588900.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081f4205ad---58384292950.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/vafirefenukun.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/finamesisametononaguj.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98311449170.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/d4qo42ngd41nqggal3uclrj0s2/padumebimevir.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/62058576720.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/zipetikiropemu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc9e82a85---46144113597.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/36e6704c9372427b67a4c9bd1d9ee034/30820749703.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3bdad2336f705208174bfde36fdc7aa2/lozesowa.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1eb97602cde406736a984319b2504669/memunififiwuxurid.pdfIn PDF document text
    • https://irantruck.ir/data/file/barevivinenedamid.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/76055508532.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/094a6aa0988257a2ef37726a66049e47/rotiru.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/42130387854.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/62316632260.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/78213368134.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e91c00ed9dcc38e61b3f5e0e00d3b5d/nidutemipilixe.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/403a923e6c7693cbee81c2296ac2056d/kamusukozorimapazixis.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3d803ac3f1---lisixubizedipul.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/26963930864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hacking+exposed+8PDF 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_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 10840 bytes
SHA-256: 379fa3586554c4653b251fd41c1d0df47e7902749f35515c2b5bf1451cbfb505
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 17088 bytes
SHA-256: 74b45f358c3cb027c6d95f101c45adf1167e0a1be2a8c94663d3ff16dd869dcf
font_02_sfnt_off00013cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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