Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0dc1401794f2cf…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 22:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33b3ad20492e8ac11c0a84f7d18e32b6 SHA-1: e39267640803ab2ccc5343e40ff0b06540f4fb78 SHA-256: de0dc1401794f2cf3981cb5ed3c8b665e5fcad04e2917a15d38fa4ac4d8319cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe509208c---79083862267.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e952b568---71000807306.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8da199f5---bezerufuwexoxerego.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210701_756C00F2DA6ED665.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8232672c5---nexewopopi.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084b88bc9a---28825029740.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c870e83efe---16340150266.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc2a814fa---18148062213.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/446b8cdc45e8638d8afc53097dbca2a1/navosur.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f3e2f13b6---jatuvegigoritekaxaruboxis.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/c4q289b20mo50jtk8fn0chgulm/78126798226.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd177e38e3---87433555406.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/85189440704.pdf
    • http://e-district.org/userfiles/file/94382174443.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/61tr39kh0e09vep66rs6nv7s64/63007301848.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160923b5a10749---14199252916.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf86e1347---14730637876.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c2f80756cd8f8deddee81af12da305a6/17327188546.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceace99d75---riguro.pdf
    • http://granite1962.com/clients/869125/File/wabetixatozike.pdf
    • http://westernmaki.com/uploads/files/fisavodetotoz.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c681622f011---59371747571.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/fa0dd165089f74556ad1360d68680f62/21147821128.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=will+the+sun+rise
    • 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_off0000f21c.bin
557ecde332847898f8e4c6bf021be55871858c6b1efbfa27da49ac79c9bc467f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 17928 bytes
font_01_sfnt_off0001217b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
font_02_sfnt_off00013992.bin
b93ff178932389e7f23f4015bb932828a59236a256124c52e667de4285c91ae8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 10016 bytes