Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8c75821a3ccbf7…

MALICIOUS

PDF

96.4 KB Created: 2021-09-16 23:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d6f8349000057603faeac61cbcd6684 SHA-1: 422c44b088d8e13feb97d53d200ecd6263cfe177 SHA-256: 8d8c75821a3ccbf724e6f243811f0e37b4c519fb46c2f5418bfda6026b2f8455
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent malicious archive, a technique used to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.jnvhardoi.org/ckfinder/userfiles/files/welejaxifelabufilalazapi.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613721a00f110---56971219657.pdf
    • https://literie-depot.fr/UserFiles/file/89594177285.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/55aedf969f9470c8e421a60ee34d62b4/zedijitutimujutobuzom.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd32c17bf---kitipivivowerolomepekalar.pdf
    • http://albino-pitti.com/pub_img/file/49850471108.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/be51bfc9d05dfd7b96445a220facc8f0/64050256313.pdf
    • http://chinalabware.ru/d/files/87485316908.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5062c525cbc3680cd228a8c23265746c/vulabenelekugutofizilida.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134733a80073---bikobisinipig.pdf
    • https://12shio4.com/contents/files/56184119519.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1dd35f06e---dogiteg.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/8382070072.pdf
    • http://assushop.com/userfiles/assushop.com/file/57774917188.pdf
    • http://polyalpan.hu/_user/file/rerof.pdf
    • http://belloverde.net/emailer/file/99685836161.pdf
    • http://paoladebenedetti.eu/userfiles/files/kukijezenafur.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb61753762---duzilupigetixagafu.pdf
    • http://mytrangroup.com/uploads/userfiles/file/dalowugixirileko.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef460269c---sadowoburesuziwuvonus.pdf
    • https://alsultantrading.ae/userfiles/files/65296635084.pdf
    • http://homestationrealty.com/userfiles/files/45526760138.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301efa11c52---32321078241.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dead+rising+mobile+apk
    • 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_off00010fbe.bin
8fe2075e9607ba411a389ff1ccd91bbc73879d2ee7769ea4e777146fa59eb5db
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 19664 bytes
font_01_sfnt_off0001434e.bin
2f67510d4e8a2e95ca5c3d56446c2f9ade24495af519465639fcebae23d20eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 10868 bytes
font_02_sfnt_off00015bdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDF 16792 bytes