Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f8f094f46d3990…

MALICIOUS

PDF

76.0 KB Created: 2021-08-31 22:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3062a13797feb4735a856c4cf632c67e SHA-1: 557bfb909d91ea641433864d452e50e4d3fafc9d SHA-256: 72f8f094f46d3990b450843571ec0ccf33fc89cb5f7997ad4603d764d0cd5a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, which likely serve as landing pages for further malicious activity. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to facilitate the redirection.

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 https://archism.ru/uplcv?utm_term=hume+enquiry+concerning+human+understanding PDF link annotation
    • https://larioenergy.net/uploads/file/rufugilejiwarapebejak.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1c594a2143cb03c41fa2b1a9d86db2da/kazakavovar.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076994c67cb1---1272337769.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/31eb46bdcb680e29a28c7933053a60da/21803464908.pdfIn PDF document text
    • https://activepymes.com/pub/file/lelezosurakosijevigupi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e71a7aa4---61475050672.pdfIn PDF document text
    • http://transport-vehicules.fr/userfiles/file/90323955506.pdfIn PDF document text
    • http://atek-ent.com/upload/file/92385630762.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f1f4ac61b7f23658907c8427d401e72d/92827962346.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161104a461215d---jebovizavo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sukow.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fac18b51d---kuxizojamutovot.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8ef86587---makonukoxilexirazasa.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a9a8488380d167b87d651a0c4a72b881/54975936980.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/66605987957.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/lidizemomo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/82405603762.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/38880707769.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e91f5a26393b85f4ee51af9bf382ba9a/83460554198.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/51f16116c01841a2e4653ec9908ccdd2/nevajasejulaximimir.pdfIn PDF document text
    • https://rm-parketi.si/uploads/bepogasukebo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f92d89c8fcc892e4dad276ba33dff463/58772705597.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/80999782645.pdfIn PDF document text
    • https://clubon.top/uploads/files/57595643357.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/80720558300.pdfIn PDF document text
    • 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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 11120 bytes
SHA-256: 30ccbbfc601cada38c97137d66acbcef95866b9c1b4683c4ce9ca05dcf842d61
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 17476 bytes
SHA-256: 36ad8ed951d17ef3e7cfbbd7626a8b2edde3d84644f1d52fee93bdfcc993b95b

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