Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb464642f6a081f…

MALICIOUS

PDF

92.2 KB Created: 2021-08-25 15:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd8e61f2534701cc739870bf9f338bca SHA-1: 9b957533d4bb1dabcf8580fbc025a003e1f2e871 SHA-256: afb464642f6a081fc3f3406e35ce33c6c8206dbdcdf5be293372ad00fef1917a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://5a.ro/ckfinder/userfiles/files/bujipozufatapifezuvoju.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/67018476badbe33468ed20367baa82aa/9330025089.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/82421920065.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/vivabaduwumekiduzuxumot.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68fc07e80f---35577915695.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a80003bdd3c---5872480745.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/185d2d3ff366331b7a42cfd45cd6c917/jugosow.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/268025674.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/65365319332.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/62596208254.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/32148285086.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/46835093575.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160727591c0d35---35384531618.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/36308883098.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/koxuwufavifomelupu.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/bibodakuworaxakix.pdfIn PDF document text
    • http://distributoram.com/files/file/kukezuwuxapewulufawi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0c849e60---60905511632.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/ligawi.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/pedelojojowivolofepuza.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/45530083116.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21c37f4a2---50572020569.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565ee870ed---mupewuxikixovitux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+anime+girl+sittingPDF 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_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 17132 bytes
SHA-256: f147ca8d378c0933e491c52d2d6b4a69037cfd2926a5f6f8d946f22b9c7eb6ad
font_01_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 10668 bytes
SHA-256: a51b2b0ad31557cea6b2071f851ee0b258421d7aa6b60b59bd6268120a0bd8b4
font_02_sfnt_off00014b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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