Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c77df6722b922b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63d8b82d524f06ad9777ae302f203f6d SHA-1: 359d89cfa6cf0a6a04cdf02aed0c7b0f22599141 SHA-256: b6c77df6722b922be329e91dcf7713d8f6ca8b0098b2c6c8c3da66b3de1c7219
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan. It contains numerous URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern, although the document body itself is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zae.me/datafiles/file/nowapuv.pdf In PDF document text
    • http://jinwoosmc.com/userfiles/file/vuxegenozovu.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/podapoguremebidakot.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613576c8af3d6---fixozivu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/dabane.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/pupomelax.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210902_231830.pdfIn PDF document text
    • https://digireg.com/upload/90743427841.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021971638255462.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090349199711.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/74069407608.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/ligofejuvodibu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/tenoxuxivivifatif.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78806bee1---nimatosokonaxiloropiv.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/manutapagozulenefunug.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28b4dfea9---varojozamoredowibi.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/77173949479.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/9715791612.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/dinujexiwamomalixobufit.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/78667243997.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0flvlfqunn7a5eusf4tatfpggv/48784557300.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gonajasig.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903134442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+alternative+contacts+appPDF 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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 18280 bytes
SHA-256: 0cc9ffe825450f8e6a590140cb33e1de31f44d8b88863cb1e6c9c1d4de420e6d
font_02_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 10556 bytes
SHA-256: 08af7243dd721da4e15b8819c4dba3e1dfcc854b027ac929a090960122460ced

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