Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f524d68cb36857…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 23:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7561881f903590afb6ec0d0751d2ba1 SHA-1: ba0c9bb638ef631019b15902751082872cc1ba34 SHA-256: f1f524d68cb368575cb053c6254b0918008bba74f5548de64055c5e461e708df
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable hosting or compromised sites, strongly suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://asianaccounting.com/admin/fckeditor/userfiles/file/nibubarasaj.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb836f51829---kelaxutomamoledunekaw.pdfIn PDF document text
    • http://emannsltd.com/userfiles/59346728298.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/93704460598.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/kanizosasigofe.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160993a9ff0af6---wazadobabuduwuxipumamom.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/39261132629.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108444d8f397---1441429556.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/2107251028025440010z9s65xvz726.pdfIn PDF document text
    • http://24cvety.ru/upload/files/jokadinaperefuzewuta.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/juduliwokaloluvesi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3eb30301---wuvilowepipatategadisa.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/pasuw.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/24624721138.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610504d29c1e2---21655799717.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdd5485701---gifukoduxusakibiwa.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/96240247079.pdfIn PDF document text
    • https://agatanorek.com/files/file/39130131609.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1eaa4af763---42541521918.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/pilajadusubu.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210825045359.pdfIn PDF document text
    • http://paliukenas.lt/i/File/5796723565.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/podunezasi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2584393bfc---lotefodumesalesef.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd2b2d8a8---fuvozixevimozazijozule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=las+cinco+heridas+del+alma+pdfPDF 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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 18348 bytes
SHA-256: ee3d73759af2c40ca7b07d2e7365b88ad2e47b53c4896e87082c4c84edd5128b
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10744 bytes
SHA-256: 62cdfef04c9a438775ab5e027f9a91dc5b4417faa0c7df730e509a7617827f3b

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