Malicious PDF — malware analysis report

Static analysis result for SHA-256 150c57d156d29588…

MALICIOUS

PDF

89.4 KB Created: 2021-07-09 04:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 160959f3a7377dc53391fdad68ef8c16 SHA-1: 4598f6833fc27009a9b521c553a4ed622456ca43 SHA-256: 150c57d156d295883f28da3e6270ea4ad5c701bf783a1546a1a1689f3fd65739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://allytemp.ru/uplcv?utm_term=building+a+treehouse+in+minecraft
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607360c6baec2---31537068858.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6771ddfde5---94138716771.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0eb0cb038---64850165880.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ns55qpll0pt558re97kv829qcu/gekabuledesilotamiso.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f03e3d243---wusurodi.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bf3ff9dbf4c3358e4e5968c7aedab261/91907871215.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3cf90f419ac3435c66fe09f9d2c287e3/72171908331.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bd01b254804e9583279aeb7d89ff598e/vidifabanazukeni.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/taduzisekexuxeki.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54318ce2a---83314680067.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f3934d7a987565b6332435dabe0e8f33/riloxasepujodibagoke.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/96755356661.pdf
    • https://pet-fashion.ro/mm/file/25949423682.pdf
    • http://alliusie.com/userfiles/file/23693657380.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4415f598---fofitopiposu.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba196f1ae---xenefakirurumudazet.pdf
    • https://theelementrama9.com/userfiles/files/furubipawipozopazeg.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d1f03a92f2d6c509b4ce0792ffe999cb/78851422973.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b5a4ee46---jotifajojo.pdf
    • https://fedico.ca/upload/editor/file/tuwetovof.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a13bb13fe---32751511391.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/95579527240.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f05dbdeacc07f65c63b9316074b106b0/26338973386.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e6.bin
c50a548bd1737da561e38a197de58eea7a817315b1849e31669475977274afd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 17480 bytes
font_01_sfnt_off000126e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 16792 bytes
font_02_sfnt_off00013efe.bin
10909c643088bf0c75f36535894ab84f8e9aa0a81efe6aa7faa5032771bd8cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFE 11076 bytes