Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63fbb4967d0d0c4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 15:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 747f2b7dd5d53f81648cb1c167919336 SHA-1: 1e17c08b3a4c10dbf8961d0a45333e888d9b5fa9 SHA-256: c63fbb4967d0d0c44927b4461377e10eabaa2ab328762436cd0a9e9ffa9ba83a
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pkpneu.cz/userfiles/file/57678260451.pdf In PDF document text
    • http://abwcrainhwy.com/uploads/files/2683419838.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/55013011394.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mokfeh0v4gs16jqp5npm47r83e/87274063422.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/baxunagerozididaregu.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/33751996974.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/66780847885.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/30188640607.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jaduturugiwinaliwajapaz.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/7286059463.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/30270058601.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b0adfd5c640a07daaff856f35eeacee4/75730250401.pdfIn PDF document text
    • https://petek.biz/resimler/files/14765402000.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c808724eb---78623690860.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_B6BCB04C1905AABC.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d21ff65a347e2d2b8be94eb5b1ef2a19/jotenibigabamisekipeka.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc7aa5b2b---padazuzutosepagomimeletan.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fuzuno.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0eefb6381---xasapepugol.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/19409394368.pdfIn PDF document text
    • http://jarosi.hu/files/file/vedusofusetu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/lr5ma3p3anvq935kg1uq2l1g8d/baziwoturujodadejadob.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d46c2bcfe---nopisulirewinewoxosutowe.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/63441689725.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/pikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hirohiko+araki+art+book+pdfPDF 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_off0000b80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 10368 bytes
SHA-256: 89df0a42eb16414d63044dd87b0e65590b1db39577c1a18bd4d91ec124ac086b
font_02_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 17816 bytes
SHA-256: 33862f455905c0a3ab95a8b73a5e4c2f9debf3095aff6f43a325a15e1fd38a7b

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