Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0672352b55412f5…

MALICIOUS

PDF

79.2 KB Created: 2021-06-11 12:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6160064a65729dd9009710201dcf4818 SHA-1: 9551a310ad0ff5d22cac05ee80035eea129abfc6 SHA-256: f0672352b55412f5101f8fbc9fb480dbf74bf075f0d5dbb96cf8ddff389a9892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The presence of 'netacad chapter 2 quiz answers' in the document body and URL parameters indicates a lure to trick users into visiting these malicious sites. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving embedded JavaScript or other exploit mechanisms within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=netacad+chapter+2+quiz+answers PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607186fef1d83---molarexogogerebu.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/muxapobafasezarunadokadix.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b22f0a497---26719688805.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b27dfa7cc89---raduremamamitesater.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1a8e923771a3a3d72b89772d2f56df49/92046384960.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e07f75e92---45374963162.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/e9kpo8knmop1hfo89vrnutmq2i/jitaxefonud.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/510s6mfacitt43q2dd0e1nlmdo/gipatulek.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb53d47ded---70368953962.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fd30ef17a56e4bdb744fbdb60340b226/31808825230.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bef81e6c623eaed42d6cc020daaa65d8/tumepus.pdfIn PDF document text
    • http://healthywithhart.com/res/file/72609370369.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/belufiwizilulubosotakazel.pdfIn PDF document text
    • http://ktcz.eu/files/files/togobedapanuwasuduginikov.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/mesonugarukerewamelus.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3b3630d9ca38a2b655f51a165f608cb5/43986985595.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69d0341f0---kusosavidexaxizeputuwegej.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986affdc235---7752870978.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf4058915---jedebejozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5496 bytes
SHA-256: 7dffa6e5100e5a00f367106d4a8e312a890714230c489750de039b1b491a87c7
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 12252 bytes
SHA-256: 931a76f160e1ae87f454b5832ceac896b282f0dceaadf53c2a37d0c30911f20f

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