Malicious PDF — malware analysis report

Static analysis result for SHA-256 83575075b82e43ee…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 05:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c62fba7c9fa90fec981ab225b68e86d SHA-1: 3bee521b8c78c49e98aaab7d7c698624d0928896 SHA-256: 83575075b82e43ee3e6faef47d0d0c4c5923b7f4975eccf397604ea0401ab21c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=game+pc+port+android PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc657ca56---13395163589.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/43365533135.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613639a359195---5937893969.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/59313873416.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/wopufaxemo.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nigozugexavijitesujojusi.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/71961423996.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/49263883946.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/watebuxopesagajedolatajo.pdfIn PDF document text
    • http://rayanchem.com/d/files/wupetiduto.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/rurerofenomasobavifivav.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/27471911252.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/64220377317.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce5665d8c---wikasivonipomedumewixoji.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kerisofunekamewejewuvobi.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/zusureduf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/votiji.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/50359576375.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/61205491015.pdfIn PDF document text
    • http://coumert.com/images/file/80295585249.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145286ce14b7---vemiwofoputoro.pdfIn PDF document text
    • http://cocoal.com/uploads/file/nuvijofoniv.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/zakukomisetojagomekado.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_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 17924 bytes
SHA-256: ae879d10cfdd22c70cfa9cb657d8fee563fcac4c3fbefffda9e36aa76591ab64
font_01_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 10500 bytes
SHA-256: 94485d4cda3c6b6bc708b108ef9270f3df7ad7275ad8c629ea0125982e3caf42