Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd115e87802eae…

MALICIOUS

PDF

86.9 KB Created: 2021-07-17 02:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29d2b4ad0c2bbabb59b362b5ad7df299 SHA-1: 2144da40f48fcaab06a07615e323c0cc54d41734 SHA-256: 1bfd115e87802eaeb9c6fd4c6768a7f65ec0de618a32a57154f4a14664c211be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e63c5a630---makapu.pdf In PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/venamegusazav.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9ff8020cd7758aaf338ae25a8bfb66fd/30420468066.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/dijapixax.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/71219968004.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/50962686051.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/47270110203.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f9e50a5e---xejivininegego.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/tutadogudenasor.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/98473152098.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/dexepifovetadojin.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608305674ac1d---90327629539.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/vh208kgmfoqrq8kun8nf1gij4b/lebemidavozivipakivado.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b00658dc6---88731400738.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/16834f7f84acef02ef3a2d488d89199a/497351827.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6ce8223um0rb57jb81cm42fnq6/15643153483.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6md7r8pb93q7ae1thl6i1if9dq/77424171771.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d7aa7c3aa52dbcc6e50929fc26e7f858/78001006173.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/ramabeseki.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160921492a25bf---32668643154.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/vofupuwuwufuwewonijabufo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210616143809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wide+sargasso+sea+sparknotesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d74c8572---39569992921.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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 18360 bytes
SHA-256: b34b835e64eae6ff5be8cadbee58fb81ca26ae72119f53bc9cda8d63acb5741b
font_01_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 10604 bytes
SHA-256: 9d33187621c4d9e1d38d7ef5daef6add2b8b3818ccd422ed305e1a6beb7c8e81

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