Malicious PDF — malware analysis report

Static analysis result for SHA-256 573f496ccacf3325…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 19:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9361eea49c24fffbbd4059188e9be2c SHA-1: 5bfb00900dcf760b5295de65a2a4e0630b0adc42 SHA-256: 573f496ccacf332560c9dfd56044c8d22386ec170169ffe2d3b44ef58c924a01
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The document body is heavily obfuscated and contains no readable text, but the presence of numerous external URIs and the 'link farm' heuristic strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catbasailing.com/upload/fck/file/dudarasugulutaza.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/13r6sru3omf52hkfb12hdlhod7/xujisanofu.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c4654632---gawajolutuburagete.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8ne369sbhk4brg5lju0n9qsur0/75555820727.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ebc6dd4ee924c88f7453817772c25d4f/vabupoxizufolosogabuwojom.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c4gs2hku60rptaj6r08nd9bsg1/vozaxejabanivesa.pdf
    • https://airbays.com/userfiles/file/rimisagajudogejego.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609516edd65dd---jobijugubagogotirasikebo.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9d6c12e3c662e19bb3b31ae4b21df302/89128868746.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ef3mtaegv5jlbgb7sheken1co4/koridiv.pdf
    • https://allcreaturesinc.com/files/files/watimajo.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609867b6837d0---bezadulukivokuruvopuliso.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/42dcf90adbb1e0e1a88e950d750fd033/96425129468.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1fd645b57065d467551e433900b2dea9/23882518909.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8801662d---39362905376.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c112323b23---zexojokupasa.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bcebbb13---98288681223.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5bcfb5c20e5833a13fd5b9499413514c/vikozotodudewaze.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1bf9b963---jagimetugotigovewi.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/cc1296e35iblucv37qon8krrfn/jonejejozaludilelezijag.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8645f2635f5ea15fa6c7c57e088e8036/zavafofepiwatofave.pdf
    • http://apexibd.com/uploads/fck_uploads/file/vaxapegukaw.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf645a231---pemurutomiwupejujom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dry+cracked+foreskin
    • 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_off0000ecfc.bin
12f22938d7f9d9658297f3f9f779ce859db42e216bc3d4a0cd89596708c20382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10532 bytes
font_01_sfnt_off0001051d.bin
1b4aceb75492623cf86ab9a4c8653cdc7decd509d285c835de623c5d9326f452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 17380 bytes
font_02_sfnt_off000132b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 16792 bytes

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