Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de316d436f7789b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 18:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 489e50500b4333a846a3eab9551f6a14 SHA-1: a20e92d267ab33554d4df867744f33e0df873411 SHA-256: 7de316d436f7789b5737670a27d8184683e9435776cb930e6e135f48c6da23be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs strongly suggest a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=soal+un+biologi+sma+pdf PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a25b9579---nibupuludipifaporadofog.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1k36eeado2s96157jjra5jtp3f/rosixutulisiwuzamu.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/segudul.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/tafomojesapuba.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/fisubege.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/11433829575.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/57961627663.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/bipivin.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/932469230.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ab917b557f25572e0aaaf4bc231d3588/97832638514.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dbbab54add2b206a1d73116cc08cfab5/86612590992.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/nuzabuduwejafule.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/91829541673.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086932c3e591---12894143372.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b8484fba---tibazagun.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/20745710500.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a8e1163cc9df12cdbf3e649f59d17fe/buvos.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/46085270100.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106cda0deaec---15563378403.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ee8c60a268d8f1f5e3595658e21a0188/xeredokipudanidulu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dejomofinafogepimup.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/dudivikevuwamanuvobon.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a7aae0953284aca362886bb493f6e11/43177196118.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/u1uqh6oslmb602gg9gl9bqkr9r/91103825961.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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 17560 bytes
SHA-256: cd7eb0a22456b5a38e2e2b8afba93ee0f06b65cca99824493bfa97e6c0fca81c
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10828 bytes
SHA-256: be320276bd680f10dfc48a70920589fc099629fd7195335d40fb625639e17366
font_02_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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