Malicious PDF — malware analysis report

Static analysis result for SHA-256 872c118c4e510936…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 22:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cc4c5c2f1e75eb49f76d9241c7e57bb SHA-1: 9a5e08239f79b260b6e1637c22676bab8a2268c0 SHA-256: 872c118c4e5109366e2f20c0aa0e373fa85b61f5cbf0092eebffc412eb930ba5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links suggests an attempt to host malicious files or redirect traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://movitecnic.com/ressource/site-image/files/78032428328.pdf In PDF document text
    • http://canadianartistic.com/userfiles/file/75038711598.pdfIn PDF document text
    • https://heyratacademy.ir/file/71630906425.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613245ee5c26b---21244093272.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/6770703617.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///fodofes.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/lopapovegaratofunudibor.pdfIn PDF document text
    • http://kleiberit.ru/files/file/34519805513.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/lenumesijukefurusunib.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/31217342264.pdfIn PDF document text
    • http://ore-processing.ru/d/files/numoze.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/73167831790.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/32116991805.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc26e6a4f---navufik.pdfIn PDF document text
    • http://honda-vo.com/upload/file/petaninumefetelubenuzi.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/kevafutuwa.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/24983181268.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6221766e1a9b2a34e72f7514a4ba8cbc/kidonewivitamowefe.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xopobuje.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/rewisazowagefemusa.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/goxedativorapodevuwonapem.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/43987252353.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916231807.pdfIn PDF document text
    • http://erictex.com/ufiles/files/12636332022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+porn+game+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 17844 bytes
SHA-256: a01baaf0929be5432385cf1fee29d2a4be2ba826b7b89f01354eab48f37a166f
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10452 bytes
SHA-256: b3a7b2eee4c23927367e5020402e47e034e16426355a8c5f7075b3367db99287
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1