Malicious PDF — malware analysis report

Static analysis result for SHA-256 071a804cb6ee5a19…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 15:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a4b1651e55f4a2248037f0db03f73c8 SHA-1: 238b4ada0b5301398429fc9015cbcfc8962c3c66 SHA-256: 071a804cb6ee5a19727eaf379287d275665630c7da468370a717d4e25c7ec3d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=custom+skin+creator+pro+apk PDF link annotation
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/ravadijutesoforabojif.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fe9db7p145ea13jjm6i8c6ka5u/kazid.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/vupibajelenaloz.pdfIn PDF document text
    • https://webhosting4.net/media/file/jusiru.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/79016899052.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/78374399936.pdfIn PDF document text
    • http://cocoal.com/uploads/file/80147544145.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/valanimetewesawi.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/dazufugobapeguxeto.pdfIn PDF document text
    • http://i-physiology.ru/upload/vorixil.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/gepogomipidu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/95177863754.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149a088c48---9666784953.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/pobaxoditupen.pdfIn PDF document text
    • https://cncunse.com/d/files/42723638108.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/rebiwurizamipum.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b0b1142c6fbad2f9154209a4e987770b/94092076676.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/atu7n8vdk53uuqlvag3fk3m053/tujizo.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/57368410917.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/31552719947.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/titaxixazofonujamum.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/36101504877.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51631030499.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/478f0b2f1ad9dcc34082f680c3fdc10d/puxuwa.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/15013838732.pdfIn PDF document text
    • 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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 17460 bytes
SHA-256: d658f588a915e9bed0f2467b7b5d205fca81cca85382d05d1dfb56caa4d98b34
font_02_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 10712 bytes
SHA-256: 73ce9e7476afe2876b4c61431dd250fe01dae89df428006e731b4db1c8298af5