Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f41c92ab4944d95…

MALICIOUS

PDF

85.8 KB Created: 2021-07-12 22:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4677587045144a6076b12636d172ae66 SHA-1: 6a43a19ccca20f5ecfba55afa6667ba5bde338b2 SHA-256: 2f41c92ab4944d95429863c8d20717214273c8ff33b7328c6c2e06197cd3ed00
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious or phishing content, aligning with the detected phishing and trojan characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2133866f---witukazojuliwu.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd21dcf0ee---gamatiretara.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096f07c5dc---ponesafosakivajojegodemo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v2n1pfoo75n89s46ioitkbl0l6/18201782199.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d480218294f---gixirug.pdf
    • http://apsencollege.org/test/fckeditor/file/7054984722.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82vnh0dirn257oe79tj59og9o3/43715879553.pdf
    • http://unipsyclinic.com/userfiles/file/20210510090658.pdf
    • http://hi-techfiber.com/userfiles/file/pufamife.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26bc62308---96670011461.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce53468fbb---85811739523.pdf
    • http://adbuffalony.com/uploads/files/66065918797.pdf
    • http://halaljones.com/uploads/files/85423621261.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/240cbfb6462329a00c03bd6b298245e5/30515546078.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/796fd1ea48d6a0b26dfdc3d8dcbf3a0d/gemibezadegegamevison.pdf
    • https://yuss.it/file/jotopugibajogutekabaxatol.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3d92b41f---80842743004.pdf
    • http://timnhanhonline.vn/upload/files/wasozosikes.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/55bdbcc8ae3edd657eb813aba35d6571/pusomozapajokawa.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7610963f5b9dc64e408ed785ef239982/37387979238.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb22a1713---82168539224.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/10361813466.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/vovudamutixosebago.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bff2c3dfe70a5196fb1a541ef350756b/dazidesarow.pdf
    • http://dui-antidote.net/images/userfiles/file/vuvixapumugirazurediw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=book+value+of+investment
    • 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_off0000ed89.bin
aa916ed41f4c3ec5c79daa991e526fd42cd99bbcaee8ede7221b6c5e450d48e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 16964 bytes
font_01_sfnt_off000119ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16792 bytes
font_02_sfnt_off000131e5.bin
4e70cf062059d7e20655b2a9612bb4bbeb389bad30c2d9b7768a1f3f4ca1486e
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 10588 bytes