Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a496dfc7f0461f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 02:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ccbf20c8a5af61892fcd2d852aeadd17 SHA-1: c910dbd0feb8be45586bed5f615379904f7ea7e5 SHA-256: 64a496dfc7f0461f18489f3e0defc9585f4de2660ddb664e980c110b066c61c0
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests an attempt to lure users into downloading further malicious content, likely for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eksiliotomotiv.com/upload/ckfinder/files/futadodige.pdf In PDF document text
    • http://smartdeal.pl/files/upload/files/bilofasiwibikevonukabo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a3517875---vikumexofezemere.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355cf04a985---ximix.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/wemigujoguralevoniz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o05vs6cvqbb82leu9a7plrv41s/24716507121.pdfIn PDF document text
    • http://etre-belle.su/images/file/suzefitulopepapaxek.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/loponimidumimugumebore.pdfIn PDF document text
    • http://geoman.cz/data/file/81268952578.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/elf14fgcfjqkq3nohjats6af1d/41998244286.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901105237_0prs5t.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/91202085806.pdfIn PDF document text
    • http://poultech.net/d/files/26884665244.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/zoxagibazovakujikukosego.pdfIn PDF document text
    • http://change4best.ru/upload/file/jujutozedumezutupij.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/53250872580.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/37248185619.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/77918771858.pdfIn PDF document text
    • http://skncn.com/u/files/tujapa.pdfIn PDF document text
    • https://mauspro.net/upload/files/15379843811.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/433276501.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/xanikimisamawivuzosil.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/pofefejemutalar.pdfIn PDF document text
    • http://lovesenergy.nl/file/19367994457.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wawidodunojebejuxusoxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+sync+galaxy+phone+to+galaxy+tabletPDF 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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 16880 bytes
SHA-256: 54b8fbc781f0819a0df58cf9fca61c9b26de25ff56c71c659daae93e3fe4a4c1
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 10896 bytes
SHA-256: eb6cf07aa5fa798858020522cb82b0abc27d4d028fc9e2f0268537826e69a05a

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