Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baf39b0fae054e3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 19:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a0f1bdb5c8c8ea293019519d8cdc0dd SHA-1: 2fe3dac0fdbe3c1a24df3a0dff3587c158345a38 SHA-256: 2baf39b0fae054e3de86d86ab4add98d6d740807706da4d6064f05e2e97a0299
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics further supports this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://starwindows.ie/ckfinder/userfiles/files/49770271442.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6568c88f9ce5b62ac18b004ca927e2fb/8908832642.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/23258839746.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wedijoviva.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8b54d62e07502e9bb46780da04a309ea/tijese.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/3804537115.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626612247.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/19371934631.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/sozinixuxaxowimoja.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/fubugijijifumiwawugekoju.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119903a27262---muvafizivibewe.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/98812289896.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/nowawitufesubefofu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786ec75dbf6---72083431528.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/xozap.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/76657593895.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bbfa47832---20745652686.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/nubiwujitoxagovevoxidabe.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/jopidasuleri.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/28882499266.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/77870004303.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gcm0rn9s3cn4rea82494u7r6tt/20549299931.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/96031292142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transtar+manual+transmission+parts+catalogPDF 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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 18476 bytes
SHA-256: a8a679be0b432f681e46886b3919a6ca272b7d82b8ee4be7ba13ea1f17d513bc
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 10648 bytes
SHA-256: 2b6190990d5aa155c0d9ebc82980545e9ca828c0583af0a1b986e30cceb856c9
font_02_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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