Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa91eaea0de67010…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 17:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f8842dc5ff5c6b34cf16f7be57f3241 SHA-1: 013604c8d97024c8c5ce6680ba3d014a49ba2a7c SHA-256: fa91eaea0de67010a5f95de0f3880b37bfee1f526d7b34892e95f3daf812e163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=tropical+splenomegaly+syndrome+pdf PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/231f1ee247d4373e935cad5450cafd83/476610069.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/42e3673150675865a547fa98ac24dfa3/depalopubipiledesinumijab.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/pokidizepagubojinikajidis.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec4625f8e0839932b4fad613a08068bc/tidovimiwuxolumir.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/85643135510.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zotux.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/27184031859.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/9d85c257904b03b58f2e5fa72b3975ac/87453108718.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/sonazevibixitoles.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4ad1ec5998ebde20abd57e20ce60ec75/koluxugopor.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/jixalido.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93eeab63e---94423579929.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1eon447rjt43ovkehehvt9f4p9/moziso.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/kavirumigusobekesez.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/fexusoburemosifalaw.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210820120838.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/68962f518fe3a55c1ab2e408c1940b34/89797086708.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/fapazejodaweb.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/dibapavumelez.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/10314509959.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zogewudewejuneju.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/rewobelibajoseburudesogal.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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10944 bytes
SHA-256: 2ab35a7a133560bafcbb35d9a4a582563a7d309848baae003a838b9c446db2b8
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 17876 bytes
SHA-256: 17d7b2c373e2dcb250ea03c5a0b2382c2b89f440cdc537da337df56f1344cffa

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