Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a103bd9991af681…

MALICIOUS

PDF

90.6 KB Created: 2021-08-12 01:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f22d8c712b735ae524bdfda5aeb59a80 SHA-1: 91666b4c5b30b06f445ccbaba1b6fa1e5754e686 SHA-256: 9a103bd9991af681a7e77f9cc7dc60817f4dfbefbd405c7cdb14351577091a1e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://krisoc.ru/uplcv?utm_term=a+gang+leader+for+a+day+setting PDF link annotation
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/ririvatokipofaxoranadi.pdfIn PDF document text
    • http://chpcentre.com/files/file/68318983653.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7f2f9ededc86263c55bfbdb9ae8d5ea6/67034454694.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/ruliviwajedejujuririmuj.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c7f9c17f---86765849258.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/xexenuzuxojorujedibi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/264897cda622962dfc82e64232aff848/26364885998.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/89449217357.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c5a52e8e---4339470011.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/66877938677.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fovogukubisov.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hs9fmed4qnd7408hekjshcisto/loridusigifez.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4e03f86---4428805603.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/jutefabadujixegamurewuv.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/69432529270.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/40585112064.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d87ee251d07---pejolobug.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/367933c7646c3eb14728bd475cdb59f4/lijugepafobapav.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/68152409876.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/ruroluzeluveves.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/de5ce9233c49ecce9f4d364b13dec398/53410683006.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b8cf0dced---45033885956.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/begabemozikoxoloxuvu.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/82306774051.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c485e87a392---19836450185.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/pavapolizemow.pdfIn PDF document text
    • 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_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10624 bytes
SHA-256: 0ff1ff00bedf85b6f1588e26d0e83ff7c7d9be46271da7b3a1a512e4614b3130
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 17124 bytes
SHA-256: 7ff5a3f310b214a24570a8540b76bf0cded512d96ee23e7ab8422d77e73b6d63

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