Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7c133c8be231a8…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 03:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e84b7b1fd20ad7af6c74ced4b28217a SHA-1: 68c4e4a07a11bd3006d24b98b0a3e75b63e2bf59 SHA-256: 5c7c133c8be231a819bf8df6605f479fd4ddcfbb5689c6392e2c619f2eb001f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially harmful content or phishing sites.

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 http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bd3b87323---56033786961.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a725771449f---86707530713.pdf
    • http://sns-russia.ru/userfiles/file/ribawupus.pdf
    • https://bednidhitraders.com/userfiles/file/39550643871.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c1a2424e---vazuxiboxexinodet.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071236be25c6---87356869273.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/92ffen3tigk28jrn60u5rt82cs/94841743803.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7213c7633061b12288bcb77de47fd737/45961360687.pdf
    • http://littlepearlbooks.in/data/eimages/file/58357421320.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91350c629---33299174940.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/gigisevebuzuju.pdf
    • https://bajrahrs.com/userfiles/file/pifowixosewiwever.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/fexuzowen.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rdcesbfre2rgii4g1vp1im0q11/mogezos.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210701_73B618A08C363305.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/jomiwumikuwupebewoke.pdf
    • http://agrobud.net/uploaded/file/garar.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7519a967e7---mawosamirizaparowunu.pdf
    • https://lexcyberia.com/userfiles/files/sufafitojudeku.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/d1187bc6529088faeacf3d570ff7af76/pojotukuzofepofagixunel.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23e57f425---46648566657.pdf
    • https://dm288.rs/slicice/file/kusizegepegirozivudi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160853fe950683---28360319761.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609498ee133c9---36425066213.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=distinguish+between+endothermic+and+exothermic
    • 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_off0000ef73.bin
2aa85d7fe98922884c7e468c0f70b82709035b7eb4ce757709ad320f4badc02f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 11200 bytes
font_01_sfnt_off00010960.bin
27b8bcf6c130dd832fb0bb6e50d8e80b8f4c655fd065031e4132b61b7b8c031d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 17352 bytes
font_02_sfnt_off00013724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 16792 bytes