Malicious PDF — malware analysis report

Static analysis result for SHA-256 2615a1770d7b5f97…

MALICIOUS

PDF

72.9 KB Created: 2021-07-13 22:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84c78bba44a040d9914571c5e636eb0e SHA-1: 57ec9b9b9eb0a452794ff766bf5b5db2e9fdedd5 SHA-256: 2615a1770d7b5f9720a947b49eae29213d1f8f3955bd4ca638cc0a25c3fb6ffc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The document's structure and the presence of numerous external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://burgaseguros.com/userfiles/file/lenozuxijavoto.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0f89713---xowasa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/503q9pds02ecma8lith8me4ftb/95073686534.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/827404eada10cd53646517001b58bafb/gukapukexesonexiwabavozar.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782b2c43598---radumadutugokufi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/womepepopawetu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/072abd16023ae6124c22ef7e7636ffaa/foxedojekomufidetapidiwos.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e5a71282da7dd3eb36979734f07f0360/58765544945.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/tegatig.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160730099c2719---60616414759.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/57162431124.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/66717369366.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/428562e46a86dd2f660a1e575b9306ed/kusevevuvugufodaruwebiwes.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2rr8p5tuhahkq0ij0459a66e74/63849006046.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/30b92ede1ab5c2843baf27dffc2ac72e/wufovetijinurejulinalofi.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210513225528.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0914877c6dc5af291840f0e3b0014755/59339346797.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/32081996035.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43df1c0ec---ritebitaf.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d8171524bb8---tiperigoruwise.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jivibugusoxu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/lonemanuvokisutoxawan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=with+that+regardPDF 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_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10080 bytes
SHA-256: 9bf8abbc740fb2d95b28029b96a3d954430b6d43ac80861e77536d5ce511a53c
font_02_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 16344 bytes
SHA-256: 456a1373558e4878123a740b1799f2aea2be918983303cdac5a457b52b5776c2

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