Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f75fe9c50943239…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 18:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bddb62cbe529256f0b7b84fd6dab14b SHA-1: f06b58e84a3699a9a8685a7222ac3d2592805529 SHA-256: 0f75fe9c509432399ce8dc18fd8f9a082bd96ef3cae6d2f838a3709a020e1912
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=canvas+o+que+%C3%A9+pdf
    • http://toyotacri.com/userfiles/files/palotemejatirodefi.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/db2694bb70a0fe7205ab675330ef8c16/tasabovubewejexagenul.pdf
    • https://delcinfo.ru/img/files/files/78646477914.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/50038206916.pdf
    • http://lpc2529.com/piceditor/file/zomufeluzubulajafobise.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd9225c97---zikukisafosidi.pdf
    • http://elverum-revmatiker.no/images/file/88598228765.pdf
    • http://pune-india.info/userfiles/file/vakunajepifaxaruminififap.pdf
    • http://master-br.ru/img/file/8750483084.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tagewiweb.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/xopajupofodigisaweva.pdf
    • http://ratchee.com/ckfinder/userfiles/files/30767255145.pdf
    • http://autofactory-jin.com/js/upload/files/4379207362.pdf
    • http://4998horo.gmmwireless.com/contents/files/32680311105.pdf
    • http://quincy.pl/ckfinder/userfiles/files/rutujaduz.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/61844189904.pdf
    • https://yenhuy.vn/upload/files/26008478862.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a4adb3f5b82018edcea398f8902828f/22148572111.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210907110249.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb30c3647---76049687672.pdf
    • https://ppntassone.it/dati/upload/file/22041339850.pdf
    • 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_off0000d17d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 16792 bytes
font_01_sfnt_off0000e994.bin
f2cab5813065f9b38ff35d9b0f1b9ea2b5c7de38288562e1e228490dc2418392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10652 bytes
font_02_sfnt_off0001019b.bin
ec8a6acae09f7956fe294fef4901cc28e050779a10b8c657ab29d34d830e13b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 18288 bytes

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