Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6ea8d05f5be669…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 03:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc5d4172c4d6e55a958b83bc571c8bf2 SHA-1: 67e20cc47cb6bf979dd2c282b7eb2cdcc70dac1b SHA-256: da6ea8d05f5be669fc3c577d66bb884455f2a7f6a8505de495b840b07878be5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a harmful purpose. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users, potentially to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://raljob.com/userfiles/file/dogenijigipulodi.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pegecd4i2o2bbro1b62qlh05ms/8930827178.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75cb4421f---mepozazixu.pdf
    • http://3gr-group.com/ci/userfiles/files/sirubevis.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06cf24022---31256615586.pdf
    • https://veterinarycarefoundation.org/userfiles/file/54401585596.pdf
    • http://brixtontaxi.com/survey/userfiles/files/51568009664.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/sofixadutodaveluxabesadad.pdf
    • http://casier-a-bouteilles.fr/file/76895197293.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907190506296319.pdf
    • http://wuyioutdoor.com/userfiles/file/xaliruxumepojilavagenilip.pdf
    • https://cplastik.eu/data/cms/file/58016701303.pdf
    • http://www.allatpatikapecs.hu/images/file/defoniwexofudi.pdf
    • http://akgwealthplanner.com/crm/files/18330597360.pdf
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/xakutozibojazibabi.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/81322069558.pdf
    • http://protok.pro/upload/files/3176720326.pdf
    • http://smepil.com/ckeditor/userfiles/files/87325377065.pdf
    • http://studiopedrazzini.eu/userfiles/files/71834121576.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/62408309109.pdf
    • http://tecmifor.cl/userfiles/file/23169011476.pdf
    • http://deleersnijder-bocaege.be/images/file/81193937260.pdf
    • http://rentbucharest.net/images/userfiles/46461294983.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///81628766332.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16143851416348---fifasavoxowiwiwujog.pdf
    • https://yennenga.org/business_school/uploads/file/35719019101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=why+is+my+phone+video+lagging
    • 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_off0000b57f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 16792 bytes
font_01_sfnt_off0000cd91.bin
66f9a606c760a44abc9c70466197218593a0d5cdeb9e1f4ec954fd24315757ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 18924 bytes
font_02_sfnt_off0000fdaf.bin
77f611ad9a22cb7079a7f4a6d88f563f43a2dca604317b01043a538ff4df3110
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10812 bytes