Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f2b51331294326…

MALICIOUS

PDF

82.8 KB Created: 2021-06-26 09:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adc9358aec6495e0fe7fb97ab8bf7c36 SHA-1: dc836f8ebcc8eafe326022f77709800c7e014f36 SHA-256: 54f2b5133129432617bb014432a0c36768fe7467e009b8cea17fce2db70a990d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting an attempt to lure users to external sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb671395efe---sujodimilapurirugome.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef51cff05---robekuwemikosiwekip.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160841afe91e2f---83182217534.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abff34959cd---besexudefawo.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb526bf4a---60631799853.pdf
    • http://studiovalentini.eu/userfiles/files/36870755611.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fce8f3a8---jikebepavinidimularibuj.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18ba099fa---kuzigoborasodipasegenib.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00d677b7f---dalaleje.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160aa057f3fbbe---84287625953.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160999c7d1080e---selekud.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9ge2gsvirsg6g00nsqnq2mo7tn/zigadezapolivuwopofi.pdf
    • http://atya.eu/files/file/39305693144.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072888fbbb98---91707216256.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160900d7a8312f---towejufuz.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/57938134412.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3ce3f34af80056b7151b5a7be6da6f91/vimumimeluwor.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nuahfi9nb4uds1assh5ktiisl9/77407027622.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/5svd789prqibjp8pj1ekb912dm/81874440603.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c324cabc81b---bewopabisuxibanapu.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ebq8hkfkmd8va3b92k2aq26th2/didegaxudiviwajabajunoje.pdf
    • https://mimpishio1.com/contents//files/dufesukidena.pdf
    • http://arablift.net/userfiles/file/rejuxubomujat.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/786a46076e1ff130aa1706d43e1f433b/26062650328.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45ef8afc92d619c02d54dc05d40a5ef0/kuzepimi.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b6f7072e---bupifumexizobowowizajop.pdf
    • http://loscogliodifavignana.it/userfiles/files/xozuwadukozumijal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+the+angle+of+a+triangle+calculator
    • 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_off0000df9e.bin
692a93cd5dfb1272fad45abf9215cb50b477211e76dc5c229205842fef2610d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 17296 bytes
font_01_sfnt_off00010cc0.bin
e020ed39dcb9d36309debebee8f17d53bc3903de22b950af56f381f1c74eff65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10764 bytes
font_02_sfnt_off0001253c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes

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