Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6c1c10ce4a08fc…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 01:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 999e765bf1ab5806a3444fe2f9cb4f12 SHA-1: ddd49839df356e3d839365a075954b31a6c41d34 SHA-256: bb6c1c10ce4a08fc28df278041effafa029a7405a3f6020995beb22be241c88b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093077cac74f---litomusipekosokiru.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2c2c7ef3d992b9204d5314ca83fdc6ba/suzinezel.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce155b8cdd6---zifebategajulazosalemel.pdf
    • http://laweasy.kr/userfiles/file/45044579352.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0901b01fa3---kuxusozitepexederakazig.pdf
    • http://come2menorca.com/images/file/domexisemesadojun.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e044e100---98651427727.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160808ce8de9e8---xitezakezomululabatadolu.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/59030654877.pdf
    • https://demircanticaret.com/userfiles/file/jugavalodezifedujivig.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c1f0342d60d122f0fe12b6ac5a810fe4/49380450947.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64b28c43ee0773b86b211f0e8798759/13367881319.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/102d3f19454186a208ad04d8f77a3cb8/57229237290.pdf
    • http://hnkingdee.cn/Files/file/202168131917.pdf
    • https://abyway.lv/images/ck_images/files/tasifowefojozuwinope.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0f38b7c1b25d4853fb9adec97daad3f9/76480045082.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959f974ef3---50728290695.pdf
    • http://bhk-aindling.com/userfiles/files/79279923534.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857bfed91b3---sifix.pdf
    • http://onestudent.dk/userfiles/file/wanosi.pdf
    • http://techscreening.com/userfiles/files/livezelop.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e7c836e3e7e1d6ccb125daee3ea00bd6/zagasabenoxepalubo.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c331b59b9c---rumevogo.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9af5001ba8---gujasokunogixasogapo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=deeply+engrossed+meaning
    • 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_off0000eba6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 16792 bytes
font_01_sfnt_off000103b8.bin
88829bfc665c1a4a94c822596daa0292ad8339923d14f25b5fb78265d1c37f03
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 17244 bytes
font_02_sfnt_off000130a2.bin
b40abf73799e7572b477dc685d49240092a161b6b8c143a61fd7cf419b7234ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 10752 bytes