Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5b1354a432f289…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 14:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90429b5c6d491000c6d093411748edb5 SHA-1: cba945f9a1391accd152701c94c4471efd5faa11 SHA-256: 6a5b1354a432f289026988dda659fecd9bd7cad045f3976aeb8ddc6466578ace
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or suspicious websites hosted on various domains, likely for phishing or malware distribution. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/91de648efcc3e35c83e56c90c36d7e7e/26738353265.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1a4f07662c6a375101750fe2f2104f6f/tagijobajisulizil.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/545be7279f0473917e3dfb7d41883a6a/fumajedivisid.pdf
    • https://soudurelausiere.ca/upload/editor/file/85129008268.pdf
    • http://www.jindatunnel.com/up_files/file/48088253664.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0qau0n91loa5urkfnrsuh46fle/dezinudififivo.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b81423c5---30480201855.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd21b4662---95251775370.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef42cccb14---rowiwanubirerixularo.pdf
    • http://omonetach.pl/foto/ilustracje/file/seribonigibekuz.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4917f292dd---92422148900.pdf
    • http://pozitron-s.ru/userfiles/file/kewokakawopovoko.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/883710b55244db4baf584f89fc5224c0/20003330665.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/81f22fcd4cd221f41f8a742f8a05095a/gelod.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60d638efe---50554769389.pdf
    • http://dso-fuzine.si/docs/61865790683.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607062bf4bdf5---11437261683.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8100c5a9a---10149663276.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/xuraparakojumegebidex.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab265a25d---13022847335.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/616ee92e75f32fd6e75ea272c1982eec/fuvevalefi.pdf
    • http://blueyee.com/upload/file/17000513846.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gyms+with+pools+near+me
    • 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_off0000e968.bin
fc1ccf4b38494e1eb7587a4163733155fc9203dd0312fc8f639cd4f6086216b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 16740 bytes
font_01_sfnt_off000114da.bin
952a3a411badd63fb14912629c73b73f6db8d6974183611b4680dd1bc94fc4b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 10756 bytes
font_02_sfnt_off00012d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 16792 bytes