Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b263c29c1243de…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 13:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf0e9519e8a66135bed0aa317d5970f8 SHA-1: 89511611e271bb3faa2b04b135344a79c94b55f5 SHA-256: 85b263c29c1243de298f70ae65b336363d27cc8e5b038ff23395b04fe3f65a5a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The file's structure and the presence of multiple external URIs indicate it's designed to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6a5219a2d6063d7853944e21195e6bd3/41604775969.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ebabea425355c8a92be222dab3ae643e/88113595151.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlcnd79ul1b6ef8g9bh4ukn7df/vudabovudamizoxomepifunu.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/45dkku91ii24mj5mpdmqvafp6p/62528306570.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d076abc2ba---dokuxitata.pdf
    • http://amandamaitland.com/images/file/98564043709.pdf
    • http://airsoft1.ro/files/file/34281264254.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q7sp37nn22prv6qbikh6vg2934/fawosukimimoxuselatu.pdf
    • https://habibitours.com/ckfinder/userfiles/files/15832963421.pdf
    • http://ranaghatpchsschool.org/userfiles/file/37305727664.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160838d7910db6---weronuvuwimunoponoxezu.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088733f4c1a5---63531423579.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/da2363f321a04171e39274af5b61d18a/39690577103.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a192e7e0c4---15191642326.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-19/20210619111527434920.pdf
    • https://okud-istra.hr/userfiles/file/92912644101.pdf
    • http://bukharageorgia.com/sites/default/files/file/74907354477.pdf
    • http://zdrowejaja.com/Upload/file/65434014987.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/pa4rri34ojahapcv1kl963tupt/tevalegibagalijogejoroj.pdf
    • https://gw21.ch/uploads/userfiles/file/29617164376.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9f7d6181edc2aa1a980ea42cb6c38342/pitimizomubenosumek.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7f4087374---82282754640.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e6jtshou1r88ibu9poafopoeb5/79385422589.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=just+touched+down+in+london+town
    • 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_off0000f184.bin
077556e96ded9a59a92e8ba2b515bd5840a057ea7dd98456a0667bbb3468a2d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 17568 bytes
font_01_sfnt_off00011ed3.bin
2e404ca81eee78b0fdd490c26a57a016cc17581982c18c5b09908c2401902ec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 10380 bytes
font_02_sfnt_off00013656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes