Malicious PDF — malware analysis report

Static analysis result for SHA-256 e981bcde77e4f637…

MALICIOUS

PDF

94.1 KB Created: 2021-08-02 12:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 531748080599adebc0bcad1d75c6cf44 SHA-1: 9b57ec63a07ff3a8da987e317218881725677529 SHA-256: e981bcde77e4f63761946c0d1ed73b22c82ca4ce3087662e7addc6e9073146b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=is+the+movie+abominable+on+netflix PDF link annotation
    • http://handsonmontessoripk.com/userfiles/files/xedixozepiteton.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3679ba116793c4b1436bb13cc1928e4b/13881061888.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61bd78a397---12849969437.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/jagilomotifimowejatuxapu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4781b184c64b5555679482381943a8ec/subuwadumuxigiba.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/50523322166.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f86c399b3a35ba06d8b5c507ff5f8c70/34718893689.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/74269907805.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/67bc16a7e72fc94ebba2aa10c5639605/wavidagawinaloriwufetes.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081ab14e9c---2737345065.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503080725133.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/23002670834.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3f282956f6870840469db41e7c26772d/sefopasala.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/86338305018.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/70251939992.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/38450773247.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51db1f17f---15518982498.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb67d0b3c4---68408496682.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acda3734c4---94062425788.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47de8a645c---nogedifadakepukobizo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/86032492112.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6cbd55f679ff98789d93be72758be532/12075152355.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077df160408d---fipakekug.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096229b6f05b---bisakaravo.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_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 10636 bytes
SHA-256: 4183a83d40136e8d6885f9913c4b190a2c490c8420bead55e6464cd361c62d17
font_02_sfnt_off00013d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 16612 bytes
SHA-256: 2f73ef0fabd9ed4555938da52ca5c1f6e8f8c875620bbdc3a8690b9a14b87d5c

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