Malicious PDF — malware analysis report

Static analysis result for SHA-256 9049f763535de6d7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 04:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bf06dd11839947a9eeec8b3b4de5241 SHA-1: 02379e69ddeb882702b28476262bd24b04f7e7a6 SHA-256: 9049f763535de6d793d90b7e349a8ae29fabccc751a22cef91be11e5627b57fb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=wallpapers+de+gta+v+para+android
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qd4kk0ll649h9hcbujo4hqkmce/89091198229.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d0aabb89---kajosoletogarenazinus.pdf
    • http://zaiger.ru/img/file/nenawufexibomepesurobuvod.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/59627091210.pdf
    • http://kammed.com/userfiles/file/25912293596.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/fixasakupopexatosikif.pdf
    • http://ducthanggroup.com/webroot/img/files/luxodikejexajodurafif.pdf
    • http://security-m.jp/tool/images/file/20471867761.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8c2d07ec---39676711011.pdf
    • http://blankheich.de/images/uploads/file/77151278766.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea20478cdb---vaviwadimofotir.pdf
    • https://xyoaa.org/sites/default/files/files/ruwunuronipamolima.pdf
    • https://hosvagyok.hu/userfiles/file/zefapudosudekefeg.pdf
    • http://peak-experience-europe.com/images/blog/file/jagupamoriru.pdf
    • http://nhahanghienminh68.com/upload/files/51050614728.pdf
    • http://accessprecision.com/userfiles/file/61724349989.pdf
    • https://mirrorlink.com/public/files/files/gefazegaseluxu.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kufiganudetavevat.pdf
    • https://unovosti.tv/ckfinder/userfiles/files/namoledegegexisab.pdf
    • https://leciv.fr/uploads/FCK_files/file/19664104646.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/28206207735.pdf
    • http://atsolution.org/userfiles/file/20210917020433586776733.pdf
    • https://willes-gb.com/uploads/files/202109141022345687.pdf
    • 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_off0000b8b9.bin
83ee3cd7f3e7885ec7b6feb0a03940b50065829db06a74b19e227a27a922641e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 10628 bytes
font_01_sfnt_off0000d0fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 16792 bytes
font_02_sfnt_off0000e90d.bin
55a24759c0cd7d2d292cf01cff69d21712d1449816c367784e05a81df535c680
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 16232 bytes