Malicious PDF — malware analysis report

Static analysis result for SHA-256 0438601dbc11c6bc…

MALICIOUS

PDF

95.5 KB Created: 2021-07-03 11:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f7b7727ca9f1baa3a75d067a8dc598d7 SHA-1: 7bf6eb8ec0792f24217f34f73318af599f0ab09b SHA-256: 0438601dbc11c6bc083e283bed55347419aa6e63a434aa31287017f734d807a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9478471c2c---nikomoxikuwinuja.pdf In PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/fowixi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/93502806575.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/foluxumenoxelewufupegig.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/92196162482.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f703366ba6d970bf7e9804f21af00f47/korekipo.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/57591006248.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609188cd78568---14040557774.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160df8dde115d5---29691836022.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/33159937699.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/levefudaseke.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/tekoriperegekafejetuvozud.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fe46f325b164c13c22cb82256c470560/kalejamawovofetitanugus.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077be0b375c7---defadakefoluxoxokabum.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/orbtttq5ih2p2dua5stdqnlvd1/9266377106.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/92895349965.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/85a5d611bb929e37894c1ab62353972d/7269422692.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/fnhnju7tpevobrefpvvvvt5782/48968508602.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa788fadb0a---teseriterisugeju.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9bg99kibb8quk33vu6vakegef0/woleranabowiru.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a307839f21---muruvekaxupeterivikadobaf.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3f1c405d---13410630237.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a907b541af---juvajobujokog.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210514194602.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6116f9f8b0---xokiwajuvufezasesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tv+show+emoji+quiz+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 10920 bytes
SHA-256: e590137c0f577234617cfeac67ad81c70235b1222f3d4d627a92b1e4f2820d7b
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 24112 bytes
SHA-256: d1a59a20c3ef746e3b6b41cf97d38b2d1b49bf4b4c3fbb5c62a90f79cd5666ef
font_03_sfnt_off00013eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAB 18652 bytes
SHA-256: 4c73a5cf0b253d39869606d2c5720fdaeee7a462b30b9a49fbbede7332cff7b1