Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cef3ba8c65e58d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 08:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad05bd1d13e8899895b9c248c3926e5c SHA-1: 8534934f7e53fba594988a162bc565e1d90b1432 SHA-256: 37cef3ba8c65e58d700456462148dfe848fe5ade93657995ac2b6bbb7a24922e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://voxel-avocats.fr/uploads/file/85844807060.pdf In PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a8de898f18a7157718c9b82c0c6ca569/muwimagabidokesuso.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a05194c2e91---wepoxapawigozuzojesojub.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7ltg0c0lf7k4802jo18u934fh1/nugepipip.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/9atlqirokub2atk66fob8sj8e1/zosejatame.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/67745e43f88de713a552adc67106e7c2/surip.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/45831975297.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/dalazujaxupugajafuju.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106132315453949259g3thc4eni3k.pdfIn PDF document text
    • http://xtra360.net/campannas/file/wogake.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608abef22b7cd---36064655771.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8060787a---savojamabipakafuzapijaxa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da43247234d---jodusob.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/46220444881.pdfIn PDF document text
    • http://scro.ru/pic/file/2242600907.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1b2d47d2---tuzawitonu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820e34aeab8---48944287043.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2f462146350a7bd7ad5a38eebc654bb2/81941227160.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/tasulojilumemaver.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b5391dc7504fab2f3e8df914671c4c59/vakejizid.pdfIn PDF document text
    • https://marosme.ro/hirek/file/44136342364.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/301aff7ac9aaa1f0c07267387cc1095b/7207985649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lowes+counterbalance+forklift+test+answersPDF 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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 10704 bytes
SHA-256: 408cc0df90637e05b5653199a4251832a40bf2b70beff8cd908b32807f7f38ae
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 17156 bytes
SHA-256: 20c644a6f61dfc692c709b8819206ae8e3525c4c40817dc264b702c984f1bb27

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