Malicious PDF — malware analysis report

Static analysis result for SHA-256 503767546ce051bc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1664c1ca038e2157e956d5787de2588 SHA-1: e3549d5c2a497073cf296a1383ec8cb7f8147912 SHA-256: 503767546ce051bc0709e90a92eb93f4dd81b17d7b186bd44031f02671de58df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious content, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16120d8a7e241a---62942989847.pdf
    • http://ttccid.com/userfiles/files/26095281761.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6648afa8---lavukuwexoxewunekepuromu.pdf
    • http://year-c.com/upload_fck/file/2021-7-27/20210727190726102696.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfjlfmiadtmnasb8o7s3qqrnjf/petesedikizal.pdf
    • https://sapporopools.com/contents//files/58427282681.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/75237490807.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86a8088c27---pumijisuzujuzenujetunerok.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b6844040f2d4a994fbd53cb4334c3fa/75969424669.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qim0j1a1b782ui8nkbeq5o5014/31881148209.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6a1370a40ac56dad906c7df2687c4730/59764420853.pdf
    • https://ltssinternational.com/res/wysiwyg/file/42384685838.pdf
    • http://lacasedescaraibes.fr/file/jokogimeka.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dh7tv2h8352a9d84u06okskcco/gulagid.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/37674044778.pdf
    • http://verynailscm.com/user_img/file/60099463865.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/40magt66o4mhqm599fb13nmphg/10779529233.pdf
    • http://cn-polylysine.com/d/files/gusukasu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0683e6a0---86266077194.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/k4o7v7a31n7iceeq61jhccbfk3/kurogulifitubizigubaja.pdf
    • http://www.kammerpop.de/files/file/7645325736.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a02293129---posabiba.pdf
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/luxijigunejabig.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af2bc19bcb46cc2eb1885277de157e71/wupapapopaseloteje.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13aa18a9e---tulozarare.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=passive+voice+chart+tenses+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_off0000dad0.bin
c221858731a1e8e48daaff264cb4ff93fe2270702897d7d51689174c1660bb57
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 17020 bytes
font_01_sfnt_off0001067e.bin
91dda467cba800c87858f1e4b459cb7ead2b8a49f03ca2e9869e1bd11a466517
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10736 bytes
font_02_sfnt_off00011f2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16792 bytes