Malicious PDF — malware analysis report

Static analysis result for SHA-256 04968ebfce0afd20…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 17:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65ab03d6321ab76574acecef0a4ddc50 SHA-1: 2561b964ffb381c8de4655dfd5d55a676c2d4595 SHA-256: 04968ebfce0afd2001e0ca761b09224717c3fa0863f35a3514df0d6e26beb300
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirm the presence of suspicious, algorithmically generated, and link-farm-like URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://funke.be/data/file/72453045739.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43514740---42033447896.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/46957332276.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/52859942916.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613581119288b---zirilubutiraz.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/95502877257.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/64328960999.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/zinakifexebaxiwozet.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92a5a7886---motoruwexi.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/loletugotovulapufekadorod.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/wukanivilofoxalivawalowo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9d9q0jnhm0ih5jdq4d7mb5q3tj/70057435094.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/47509012229.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/51982971329.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/jatimusovewa.pdfIn PDF document text
    • http://ailizia.com/userfiles/48804476003.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907222305.pdfIn PDF document text
    • http://mopron.ru/upload/files/pipazerukanugerinup.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0s8ihmvgqh8s09nkgpp555v0f9/zaloludebup.pdfIn PDF document text
    • https://digireg.pl/upload/riwupowuwu.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/lonokar.pdfIn PDF document text
    • https://msvadba.ru/files/file/7525152336.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58861425379.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109061448336889.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/20261429188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fame+80s+tv+seriesPDF 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_off0000b751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 15968 bytes
SHA-256: 49dd18cccc301eba1a01be3bb2a20911862340d9ea11f4126685e9c6fc9c9d09
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10372 bytes
SHA-256: 3ebbfb72427d921b1fe6fa27b00bce1c44bef0ed191c5326185a0a7d318cf21e