Malicious PDF — malware analysis report

Static analysis result for SHA-256 166ad527e8ee8140…

MALICIOUS

PDF

89.5 KB Created: 2021-07-21 18:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a293ba88cba2f45f78720a7d02cac803 SHA-1: 3e65ee08fca3c25db11c7203895669c9b9084ed5 SHA-256: 166ad527e8ee81409c2f18c84456262e1575f9969e511785020452559d4f52c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://zulassung4you.de/bilder/file/tunomid.pdf In PDF document text
    • https://aordonez.com/images/contenidos/files/posogibadiseterazofuj.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e4ea0ce60087004c16b6202cf9f70a5/8120817420.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1db84e9645158a692d8beb50347846f2/navif.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e81e6c732cda8a7ccb21141846fb5a74/verewuduz.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c87333cffc732158d4cec92eff51ba1/70272993486.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/6371697639.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6d3afe23---bavunewoj.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160844633f0ddf---nasuterilujixemifa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf47ceb58---93288288980.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/259d07ab6aca6629a67a786dc6808afe/mutowuvilusitibil.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088172e34427---jivinazosafigif.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/96626024177.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160985bc9720de---wazenero.pdfIn PDF document text
    • http://flexa.cz/docs/file/tefezoxifojurawaxofawob.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/609dhlmkv2vc1ea2kntlc1g4i0/jofotijuv.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/wabanojaloferutugitefikil.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/korosuzatudejolabifokuk.pdfIn PDF document text
    • https://blugarden.eu/file/makonunadav.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/rusukorezatofonod.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075659cbaeba---97742946866.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4abad86e6---viwolosokumewa.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6164c139e---gedogo.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/balujatojowowewolafinop.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b1bf89252.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/vividar.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/24376238623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=multiple+like+conditions+in+sqlPDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 18988 bytes
SHA-256: 6392930db0beb6132d1c2be485d3ca13eb1fee6738594e536bd529b30f4cc9e7
font_01_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 10576 bytes
SHA-256: 79ffe767dc62426686c77935154e4f9770284c0da0fb3f7ba0feaa77322e0066
font_02_sfnt_off00013f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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