Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cac6fa4b844ed1…

MALICIOUS

PDF

96.2 KB Created: 2021-07-01 19:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66a74a604f964b11c4091072e0b20cfc SHA-1: 89707d1bab48b97d74c1b8c8908d6e63798838b7 SHA-256: 03cac6fa4b844ed10241ecc757b0288cfb31470c407d241d582b6b4bed58539a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://ketchas.ru/uplcv?utm_term=jee+mains+2020+question+paper+with+solutions+by+allen
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088558875203---48146775212.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/61559804907.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b94f2304---wepafivutofugob.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a4401edcedbd82884e3139dcfd8b3e32/79386699023.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/sr884b19gbqvgq1nii6qe5qsql/32479939439.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f09ebb3d3---solovodisowanukazanubexux.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/dosolatuzifibe.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0609260b19---xedolaxaxafufubim.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e4857691---rabejijirupukarokeruxar.pdf
    • http://bartuceviri.com/userfiles/file/wilufofuvorijakisuru.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d262597ddf7---62145327115.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450975f062---69367904148.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e1599e0d---jamozixixarefewakikagesoz.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/80ef88e8c1ed8cefeeb4527a7267a047/zisitubusotop.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nhmhqjj8e7enibjne02ntpfd38/zaxokisexunevegakijiw.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a314ef35fd---80637319130.pdf
    • http://abpaluso.com/upload/file/56932392727.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f232a77ed5---24030980590.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c9652577cb0c77ccf7c053c2abd14d7/guluvebisilikikoboxawen.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7c0f0471---6922866436.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b96a480317e---dimowexobivakinevokapeba.pdf
    • https://okna-stv.ru/userfiles/files/kakadewulo.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d19d422c---wututelekanotesokis.pdf
    • 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_off0000f96d.bin
da3cea6f6e2d33af063a8cf3de2a98ceeb2cd47bcbeef4ee36a90048e7b538e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 17544 bytes
font_01_sfnt_off0001276e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 16792 bytes
font_02_sfnt_off00013f7f.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7F 16488 bytes
font_03_sfnt_off0001566c.bin
ba9d04f05abbcfbd454916d6614f6e5017dbd473db6eda2ac39ae54ff8bb0ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1566C 11336 bytes

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