Malicious PDF — malware analysis report

Static analysis result for SHA-256 320c881869d53b88…

MALICIOUS

PDF

76.9 KB Created: 2021-08-01 09:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd7672b82c388526936a35165ddef4f SHA-1: 16394f0c31232f47563484667875bfde9d8ae543 SHA-256: 320c881869d53b8893c27529ce565e5114f2096f806736102280e3c20d178e6c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure and URL analysis point to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17b53adfe---92734721812.pdf
    • http://curry-box-deluxe.de/userfiles/file/35577464656.pdf
    • http://asesorgubernamental.com/images/file/pefasekigen.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/592653f4b052d376dd6c549497460618/kumisiruki.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092945a05a58---nepofupisejutebe.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/dulim.pdf
    • http://daoltrading.com/userData/board/file/8453652467.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40369bf845---nefumukijekukoza.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/31f3824fe780ce6dbff72220de2b3e17/pitimogibivap.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fbb60f96e2fce10e67daebc4c22ae1cc/74976269865.pdf
    • http://unseenadventure.com/userfiles/file/pevivozurexok.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ee2da26118ae6b1d89ca7b3c7a3fc6ef/vaguxeg.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/222c34fb4f9d1927717136d3a5f24056/midotika.pdf
    • https://synersys.fr/contenu/file/vanasaba.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607409c187297---virofefajabesu.pdf
    • http://labonscafe.com/userfiles/zazukagazozubusijananelix.pdf
    • http://generaltubi.com/container/ckfiles/files/pawaduxezuz.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ded06e1dd93---mefujig.pdf
    • http://webbuilders.com/files/file/kaguxinulegimelilege.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/271eb5523108b5d026010f418dc407e6/jetivux.pdf
    • https://eviinstall.com/userfiles/files/dobigosigire.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=five+nights+at+freddy%27s+free+roam+download
    • 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_off0000c6ec.bin
fa5158198dafea01be4bbf091793186334a788a263699080593eceb6cf157ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 16852 bytes
font_01_sfnt_off0000f2bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16792 bytes
font_02_sfnt_off00010ad4.bin
55a7e60a6dfd8478a58fc78301a69f41290367f3b85239978093808dc268ec5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 11076 bytes