Malicious PDF — malware analysis report

Static analysis result for SHA-256 d563cb5f34c8f29c…

MALICIOUS

PDF

108.6 KB Created: 2021-07-02 16:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a17dca766ab5f942c0115b74ca41c237 SHA-1: a28de95f9a0b6223e960a8193a914cb2e50e26b3 SHA-256: d563cb5f34c8f29c0451e5c4ed378086de3791a2bd270ba11b37dd0b2b60d79b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://salkim.com/userfiles/file/71886207735.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800935ae346---28097251818.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/g8ovbkisbk1d78porkfnjumg13/99112615006.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/86524858990.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8655bf5cc---7915742156.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siboxanovarazusolanazo.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/32776019527.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c0149149b051addd8812c37b0cb5e8e9/94725751364.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0bec96ff---78555610594.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3a38e618---24844905847.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/43f65a49f4c3fe1b87a7ef8cb829e7e4/vawubukaxatesekiwalositi.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/cbmdhtfd9vvn6kcn40m550srpk/91511924634.pdf
    • https://alutat.com/data/file/rurusiresudelalas.pdf
    • http://www.toptehnik.si/images/kegadixoxojajijobope.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/it2ej4uhmsij50udt665gemlu5/28212061049.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0rclru9fto18rgjqgrsksdst5g/siwelogasewa.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2716c046b---dajusezudezobugavo.pdf
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/54207680746.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a96672ee6ed---81497164298.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3c079ff27d85344179bb87be53c03e25/fudizal.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3252baab6414ea9404814f946b81cda2/vewogo.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e2f63311783a28daee5ed9ad43a08f1d/faxom.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ddb0da18d---fomunulagitapi.pdf
    • http://abwcoliseum.com/uploads/files/56300412826.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c391883f4---92697134342.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31791529b---senekuriwu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=roots+of+the+polynomial+equation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bea.bin
8c290d06be5be0091020bf35b82346bd4523ec0659c56e6299f73265c3575d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10928 bytes
font_01_sfnt_off00014513.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14513 16084 bytes
font_02_sfnt_off00015a3b.bin
d8e9bb9fb05690333af01a5d0e96fed062f6c65a875d747857915a97de9c1163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3B 18844 bytes
font_03_sfnt_off00018c70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C70 16792 bytes

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