Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56c7723ffa47574…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 10:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f24246e450a5397f07e0e6f269030a2 SHA-1: 94ee10d72ee5cfca37d8bab3c6839c80f8865d32 SHA-256: c56c7723ffa47574991afb13aeaa235edc99b697beca5a2a3009ae255649288e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm or phishing lure. The presence of 'utm_term=virus+dela+hepatitis+c+pdf' in one URL suggests a lure related to health information, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://agro-vostok.ru/userfiles/file/bilitabolox.pdf In PDF document text
    • http://messtores.ca/fck_user_files/file/14450952211.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4d43b43fd4657bb86a39b0446704d3fc/roxemegolexavoberubosej.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tilonuxufuwexufed.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a964c77f042---judixinodidigikawupitil.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/rasez.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f38dc521d---numefuke.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/nivobilenevolijitenataxa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f269ac36b---fobadumeninosewofisadumub.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/57367565058.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16103d23d63b5d---65372213115.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985144b12c6---sagizuwe.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/napadup.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/54843620700.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/folazusi.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16267257853804.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/banixajadegosevomarep.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6mpoqrlnhhvqebgasjrqjg7v94/48535738722.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f391b1e30---10789157813.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/babigejamuwigemol.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/66748745976.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/41362711949.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/12c8u5emdn3hlc1rg4o18s97mg/51781948394.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/soreviwolexin.pdfIn PDF document text
    • http://rnralpha.cz/res/file/tupulo.pdfIn PDF document text
    • http://kalikraft.com/images/file/84641858518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=virus+dela+hepatitis+c+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 10564 bytes
SHA-256: cf980b3767f9236991beef285e3acdc368432c7b2eccf9ef634d1f09e02129e3
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 18036 bytes
SHA-256: b96e735797a0826c23acd5d1dbf2b62a59779331c1144618822e69826fa4e2fe
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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