Malicious PDF — malware analysis report

Static analysis result for SHA-256 892c633fca0cc2cd…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 22:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d4dd81dd79ba38bc7247c5a7954791 SHA-1: be55990e8377e29f32e520ec3ccfa6e9263d8e9c SHA-256: 892c633fca0cc2cde867d997cd6f5a33020d2d9700cedee6c097c112b20190bb
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/cb61236771f626ca1cdf229b1a6833a9/tajanugijos.pdf
    • http://paroissedementon.fr/upload/files/diramamozifajudomi.pdf
    • http://dansungsala.com/uploads/files/gefedifejelemup.pdf
    • https://baohohoanglong.com/userfiles/file/mirixepagado.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/583f69eeaa53e81bb2839bfce054f879/sefabodapikawubebug.pdf
    • http://russkiivopros.com/images/FCKeditor/file/rukejowufukafu.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/93629305142.pdf
    • http://gramercy-grand.ru/files/file/24405011991.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa323691a44---jepagazaxulenov.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a3126073f97240b2d0a93c67e95f3524/15862293860.pdf
    • http://al-bandak.com/userfiles/file/wedepizire.pdf
    • http://granitemountainranch.net/userimages/potek.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835d0097ce3---95783426276.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86e7e4427---wegodigafepe.pdf
    • https://lacecinella.com/writable/public/userfiles/file/10775636161.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac50de9888---78533460558.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/feapaet741lkj38t94him0n6o4/gopawoza.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c344f64dd00cdad195d1cf7b584f8358/fozixuwivip.pdf
    • http://aircond.md/upload_fck/file/88604109057.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/dolipejolewejuzop.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bfaac44efe1d08db38f0c8cd3577d75/67585009607.pdf
    • http://vds-construct.pl/userfiles/file/mawes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+secret+science+at+work+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16792 bytes
font_01_sfnt_off0001041d.bin
3395b410602f9365cf7ecda0630e9b493f6a6abda3d38069b881f58bd16e80b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 17488 bytes
font_02_sfnt_off00013244.bin
c6476139e56a986ec4123249c5faece474fe4083b69d3f2b17dd51fe8fc90246
pdf-font-stream PDF embedded font (sfnt) at offset 0x13244 10812 bytes