Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea036ee0fd6613d1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba2fa8d090e2204a7ccc87cdb58474ec SHA-1: 4d0fa94fd0378ea268f42cc2f3e28670f6068577 SHA-256: ea036ee0fd6613d186caedaff036a6ab0531e5b519afe3ec24c2a803c6881a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings confirm the presence of link farms and external URI references.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://yejida.com/userfiles/file/15221321185.pdf In PDF document text
    • http://desagresbrts.com/clients/34568/File/83318318697.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/76712321039.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/babetanenorixune.pdfIn PDF document text
    • https://soechi.net/userfiles/file/vojovoxepikazuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/69447246040.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/26072217079.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/92971302434.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303978aeb0---72674795800.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/53581395737.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/jijepafamifemud.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134614d23841---77646928079.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ljet95dl3r3820csujvrmkf7r4/49995776739.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/lelesejifetigazezaxewug.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/68410583401.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/tarowuxapolatironaz.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/93746229797.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/bekepipifokadime.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rsbinesh8ekqfig9pvr0jklog5/298103054.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/35028575088.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/62241715395.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/e52fil0rtf2931s0lj6d11m0ii/gulifuledokujulemopab.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/79595004791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=linksys+wireless+g+router+manualPDF 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_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16752 bytes
SHA-256: d3bac6bf9f023b763115d7a9503fa8c394ea844b122f0ae829ba71fc47c2c1b9
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 10800 bytes
SHA-256: 436c79d199f810a331c06fbc54e896096bafd7b66508b7d539daf1d4d5ade46b

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