Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b8403b6b8c88cc…

MALICIOUS

PDF

90.0 KB Created: 2021-08-14 12:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85bf5ea13f0e64458a17d1cf0cabaeb5 SHA-1: a5cd768b8df6245048d254016bf83c2a9e5b07da SHA-256: 36b8403b6b8c88cca0edcee947f8b510805b99bc80e182fad3593a69bbb0c1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking through. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting a tactic to leverage compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://domusanna.it/userfiles/files/4344852540.pdf In PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/21193489959.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/rulizaru.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/43412413464.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d692391c9---30704590250.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d306e18a---8287425424.pdfIn PDF document text
    • https://situsba.com/contents//files/72272414957.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/35354109156.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f20ad736---posapewevexibaduge.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/45315927635.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210707_B93629F569E42802.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d4865d8e---93772997669.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ee71306a---44486876031.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/foxofazevuvitudixak.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/37349131581.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/tukav.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833830f670---xajogumamir.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/13971214136.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tuxexowegunoru.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e4197f3933c---22391166971.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/25588862648.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d3834640---zopapizaxajopexeboro.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5388e84a96---sixemori.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/sibomet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pokecoins+hack+no+human+verification+2019PDF link annotation
    • 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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 18324 bytes
SHA-256: d957e157549f8801503c9049a42c92ed23a594e8ac6861e2d7f5a1bdb70f7277
font_01_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 11276 bytes
SHA-256: 1cf48b0ab1dec104e877dc7d6feacac5bcceff2b4cf71712c6385b3d45f184e2
font_02_sfnt_off000140c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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