Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc1586bac024d2b…

MALICIOUS

PDF

88.4 KB Created: 2021-08-19 14:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7faa97cc38032506f8da564e811c811c SHA-1: acb836ba3d9047e8f36cf05d5ead0f7a41becc28 SHA-256: abc1586bac024d2b749946e5877ca52cefd56c4db422e4e76583dcf8d73c2659
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://acryl-bg.com/userfiles/file/82074067183.pdf
    • https://legend-chang.com/UserFiles/files/gubenevitedozud.pdf
    • http://ecohost.ru/pics/images/file/dalamuronumavokaniv.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070f9823ea4d---59076672367.pdf
    • https://ntiverification.com/userfiles/file/7736022285.pdf
    • https://n-zvuk.ru/upload/file/gatejalifamejumemixirixo.pdf
    • http://russia-ex.com/2134513797.pdf
    • http://pappteam.hu/userfiles/file/84092028915.pdf
    • https://ganganagardentist.com/userfiles/file/zarijuvaxiziludekuravute.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d874f4abaae---ludozixuxifedogiguxomusux.pdf
    • http://liebherr-tr.com/userfiles/file/vanavanuwanitiwuja.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429005310758064.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/biletobulabor.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f14b3a31---61341035737.pdf
    • http://stpatricksreunion.com/clients/84553/File/51653196441.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094421dc4ada---gomokunidulapabetes.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/d2n2aoa6in3sjj8qmdr6au90mv/14421762025.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4d5c20c12171ed7438728b8528b8ec57/nonotixusasuletoxuxenakep.pdf
    • http://marosme.ro/hirek/file/larovigu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/681ec950e3c5638d7e4dab5bf686a3c0/xexupisekadaba.pdf
    • http://giovanniseneca.eu/userfiles/files/32797297623.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdf361681---gavoxomunaxalerezoga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=como+buscar+mi+android+por+gmail
    • 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_off0000f11b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 16792 bytes
font_01_sfnt_off0001092d.bin
175331a283f561b881ea0be9d14877e93cbb50465773d15099cb64a567fe41e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 18432 bytes
font_02_sfnt_off00013863.bin
f6791dad1f49bc64d244e59c64960c82c6d13698cb0b5a8ca155df7a007d42af
pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 10896 bytes