Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b208d252c0bae6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 01:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e2dd6328ad5b9c0857106f41d9c5071 SHA-1: 8b2cbbcafc6e6efa483446653e9c19246ee3a910 SHA-256: c1b208d252c0bae6a5f9356980b145b03384da9a7c20e52b656b3d6bbdec19b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://smidgel.ru/uplcv?utm_term=how+to+remove+duplicate+contacts+in+android+phone PDF link annotation
    • http://iphonedown.com/ckfinder/userfiles/files/77308339282.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/nelasuxi.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/50832218131.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kuputasobafovajanaviba.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/83910373945.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae2f3f3d87---bokafawozewejimujabivin.pdfIn PDF document text
    • https://activepymes.com/pub/file/5345227333.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161364f6aa3821---83028930597.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pf2dk8cvc087br44ig8r7d20sq/25343171424.pdfIn PDF document text
    • https://ags-car.com/upload/files/mikaro.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lifatobediti.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210901214603.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/jazaz.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/47274629553.pdfIn PDF document text
    • https://jobtiara.com/files/files/15852687446.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/pomojerimepulate.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/28910897754.pdfIn PDF document text
    • https://krusomying.com/data/file/desilewaganitijuk.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/tibelamobuv.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tolumaruwokafijovemi.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_8E5F5D36AF579752.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/57172671f3174577e077cc0bae136059/42289196296.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/vokofubulogibugelugobe.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/kigurekaseteriwu.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/17443487708.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/7351152510.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/novetuxinu.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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 16804 bytes
SHA-256: e7cf97702ff66b54ef393e0917dc81d2f1c2821b1fe0241be6006baf33e45c6d
font_02_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 11024 bytes
SHA-256: 11550a13c7c4336723bcbad190b1cfc272deb4809c9c1aa9b29611f496dffab1

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