Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2a8f9a306d66e1…

MALICIOUS

PDF

116.7 KB Created: 2021-06-28 05:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e72954642b97ac09601280536f1e7324 SHA-1: ccb98acc8e708968a2fcaf0d6ddd9945a6fe9a4c SHA-256: cf2a8f9a306d66e128ef4770068a9450962c2b9f14872f642833046767426e9e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d9bae64c572fdf697ad1a834001fe296/lupuzomifomenozuvajo.pdf
    • http://cablexconsulting.com/Upload/file/bigobimelijubib.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pohocec4211pfstn7qhb1ere37/96283047621.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/at944ljl9mjt90s1kvir9f22m9/32227328657.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/24d31092c19b600c492f55fda4aa359b/85718354694.pdf
    • https://afayl.com/userfiles/file/fituju.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d541e8d8---nuguru.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160719d5e6662b---kipazejixilafu.pdf
    • https://xo-sound.ru/userfiles/file/femaruzop.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/nelasarazepuxelifijelid.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b428a8fa4---97825236091.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/19148529002.pdf
    • http://xaydungphongphu.com/uploads/files/720295206.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kjjbil78dh16lk8keh3jmia7dc/tebofagenepivosij.pdf
    • https://alamansyria.com/userfiles/file/pesitemovowobesaninupamed.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1d341e4cc150c1e06ffb3a22292d7de8/vafewuvomuligijeneke.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074047edec86---fejaz.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2de29488fa55a1c8fb669f50865ff536/43369014792.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/fshkn7l5suqr18pdp5a3tu29tl/nisiz.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e723277d---49787609397.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/69949208e30964ad15cacd7336255489/dokevox.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vomodiwelavizufagab.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662ff8effd---pelabeva.pdf
    • http://innotack.com/userfiles/files/bigor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=multiple+storey+building
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001659c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1659C 16792 bytes
font_01_sfnt_off00017dae.bin
074ea86e4145705f6dd6d19506a2c7b66ea5110a2e46435c4b479696d097b9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DAE 18164 bytes
font_02_sfnt_off0001ad4a.bin
c421825df8ed2754beb3c8686e7a6c974c3f5c36d4d7e8680a771f8a4775fc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD4A 10752 bytes

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