Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ea0df75e49a208…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 08:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 619a7c9213b66e8450a8b5a618c698ae SHA-1: 66a55217028010bfab61a4cdec38d19f827ec9ed SHA-256: 83ea0df75e49a2088371412d9c408f2e975fe851b2ea7216f56f85556bdd0079
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary goal appears to be redirecting users to potentially malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mosvag.ru/img/lib/file/17430778357.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6a34ed48---63819052467.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0b162cc3cd64131ce72280c130edea07/tidijobemegujo.pdf
    • http://poslovniimenik.net/firme_data/files/75690403952.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a1b76ebd---tevowawirosadatokitew.pdf
    • http://biomisszio.hu/tmp/30799377731.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4bfadc60---69711948071.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160892a07d0692---revovodezelomiwi.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609187f6699c0---xipumetunireseboxila.pdf
    • http://amdind.com/userfiles/file/mopupuzimaxelugu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e19acf21---85518359054.pdf
    • http://amirafouad.com/uploaded_files/file/53573059407.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607954a8b7d0d---xakibewijidofuzowi.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210528190828.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6cf5b3560a90801feff86f5a322cab58/6240162901.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757d2f32ddd---76863982406.pdf
    • https://weeb.nu/userfiles/file/9485442340.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/222ab6dd894edd4b539f7d107a0bd7d8/40232296849.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/24315897721.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/fodulusezotuxive.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cce4c38d---jonipakipixup.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2758aff73964d85628ac88ecbcb6bc90/nulisorerixevesalosa.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/l2pasu6c3agh48919frm4njji0/35329792754.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b969c62c3---buninaxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mm+to+fraction+in
    • 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_off0000e627.bin
618bbc69449e418f0c17f179c14ad3b8580ad427ff2f4176e792c3435ae3e80a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 16856 bytes
font_01_sfnt_off0001122e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16792 bytes
font_02_sfnt_off00012a45.bin
dedd5bd7e6fbd65ff6fce9f2d91f73a4c36fa040d6db8ddfe102ee799cf7a8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 10144 bytes

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