Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1cb4a13c62f20f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 17:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b52ee773fea37011ce076c5719ce1baa SHA-1: 429e357d65f2318824a716ee1a1a274a7b55c2dd SHA-256: 3f1cb4a13c62f20f87eed4d87190f58dd4eddafa7017533558dbe3a17186f7ca
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload directories, suggesting a tactic to disguise malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cepsagibyachtfuels.com/images/photos/89803401860.pdf
    • http://www.awakohchang.com/image/upload/File/emeta.pdf
    • https://campermagazine.tv/public/file/sewit.pdf
    • http://technocom.pl/editor/file/lujejuseduvog.pdf
    • http://euro520.net/userfiles/file/1620888198251442383.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/wulopamutakepitaxupuzu.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/37965062635.pdf
    • https://houstoncoinshow.org/FCKeditor/file/puwamatonaxuxu.pdf
    • https://shellserva.nl/docs/Image/file/pegaku.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210627104642140.pdf
    • http://lideparts.com/userfiles/file/1627886946.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db944740472---penufoxu.pdf
    • http://oldtimerclub-thueringerberg.at/images/file/jamafafilemuxebebe.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcc4b48dc---pidagobekesuli.pdf
    • https://weboonline.com/ckfinder/userfiles/files/24602575462.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f284cd5950---26599552203.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef67cea6d---23502888120.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/84040979543.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/zojivivewovimufud.pdf
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/43544843937.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/08929f48532ea54da03abe77d7956e16/judiwomugiben.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60958b5eda5cdaa2638c7fdac30c006f/zurivugekubi.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7f00d679624dbb22fa3c5b1800b9db90/50079803694.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/kisugazutifofidomi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=verbos+pasado+presente+y+futuro+pdf
    • 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_off0000caec.bin
c228129408807faa2a3679601a443c550a77a40ea11c841903ae428442f96049
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 18928 bytes
font_01_sfnt_off0000fb86.bin
ba98a40b892249d7ff5f52c2d81d819b64f98028d93c5dd95a6fe7662f6bb928
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 10676 bytes
font_02_sfnt_off000113fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes