Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ffb1fd6034aa05…

MALICIOUS

PDF

72.0 KB Created: 2021-07-31 16:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e34dab01e1b6104c496ca1f10830136 SHA-1: 66db3bbb10979877c20b59e0ade7c44dc91010a0 SHA-256: 85ffb1fd6034aa05d4a7dc2ca690d4fa07d8e57faa6e9b25bb5082c278c3b88b
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristic findings strongly indicate a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=lista+de+exerc%C3%ADcios+sobre+%C3%A2ngulos+complementares+e+suplementares PDF link annotation
    • https://luathoanghuy.com/uploads/files/66621054511.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/nedanoxupilomutu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/sivejalopaboka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed0082648---nitemipajapukokev.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/2eae6f66fb454e3f3fd0f9b2126c9529/vawawuxojenawa.pdfIn PDF document text
    • http://khocabien.com/uploads/files/46185092214.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/30919438b4efdef2984ff1532ef57f41/1611531664.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffbb6e4263---55965657723.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/73533250874.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e5a9b1c0---75432273156.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/73792099385.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb8143e14---fadokape.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-30-13-54-33-71.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160864b6fea721---lowufebux.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f06141c064f414ec21dc6e1bd775f1c3/68575813171.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26cec68e1b---pinemevigoravem.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/69684307455.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/rojelum.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7d8l1cdffcaim6nj258fqa7s66/bowigujafaneno.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec880e861---poxatunofavot.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cb31ca47fd64422231f681fcb830f08d/45311398892.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/207291280.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9ec144c5b---bepizekivagilaf.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 11408 bytes
SHA-256: 11f392f2f277d760f62885070d90891a8c9bab44bd4935a8ea9227e88b498b0d

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