Malicious PDF — malware analysis report

Static analysis result for SHA-256 706bb6c85114ccca…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 11:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 592f89ddd79e95dfa6d0142e733299f5 SHA-1: 6918d3a9127aa5d896e15e61e4ed91690765cf99 SHA-256: 706bb6c85114cccad62a632324e618143438be052bf0810c5047aebc598ca04b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://garglob.ru/uplcv?utm_term=cure+tooth+decay+ramiel+nagel+pdf+free+download PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22eaa0c0e5---rigofuberogexowofuv.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4d4b1b496f0291cbaa8a980e5a94984d/89129880934.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/85600368683.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53c361f06---logivekukutoxanarunuwi.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/79308464188.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/19969899032.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160875ceb15b8c---jovobutofo.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6nsng1tec3ekq0hlps0a1vkt8a/wobotixojopozijifavubus.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jutkq7pavhg98nu0rto1r2671n/68395016770.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/tawexu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/buxowutewolun.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8109725c675cff8004c5ea3109b3d8f1/61858059117.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/66f0e9cfd97600bf29814b48982ea96e/55188141848.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b2fd062e---38007098675.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb5107f92---vuniwofenomopo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719beacbd9b---96996790058.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cb74201be85e56e536170b734c453855/62043865151.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mazuniluwobikeb.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9830df73c77c270867e457580ec9fb8c/30893850303.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/34736148528.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 11228 bytes
SHA-256: c0ecfec0042630b735ccd3d2e21d49a9a854b7740926cbb6b806f86357adea79
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 18028 bytes
SHA-256: 48ea7720718799a1423da789f765862ee63095e66197bb9a2aef06f6cbed00d2
font_02_sfnt_off00013864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1