Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46296c4e2c9b881…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 17:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: de538818bc35c02e4aa23608b2b80ec7 SHA-1: 95f3ecf90ba5071edb93b2c0de0e14b117c1ad19 SHA-256: f46296c4e2c9b881ce23b76278dbfc05d25358f5db1a19ec4b4c026b933314a6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://imhkayseri.com/resimler/files/suposavemalegavawabeziso.pdf In PDF document text
    • https://chiuman-hk.com/images/file/nudiravavafesifimefesi.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/xamesulila.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59815933911.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/jekufavalu.pdfIn PDF document text
    • http://aprt1day.ru/file/fuziboselivudewifanud.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/50224861854.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/69710813774.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/968433fee185a24f8b4b9d0b7e6249cc/83431208944.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_AD84BE586D66007C.pdfIn PDF document text
    • http://vln.nl/files/file/36981809974.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161475ded6d666---buguna.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139860e3b125---67200967572.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/sipunukuj.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///55160457291.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/75936634892.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cilp6gapoi2tioualhmjm0esq0/22575028299.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/68891598345.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/bidowagupobuvamimugena.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/14400005048.pdfIn PDF document text
    • http://sdes.in/uploads/sopevotaxibav.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/33512109207.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kofigosureradanofaraber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rope+hero+vice+city+town+mod+apkPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 10968 bytes
SHA-256: 762827e4022fc9eb79618ea498a75200ceb1119ee01be8b9eca955dc7cfc3b9e
font_01_sfnt_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 18084 bytes
SHA-256: bc014b557a63f151fccc4583960eb0ee628e044da80866b3c7a63bb7d676a3d6
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1