Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0afd82fb0a871f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 10:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a28a6d864116229b68c7a8210b2c350f SHA-1: 145a8c7e2b0a0e26b6e50a94e28f0d593836851e SHA-256: ba0afd82fb0a871f8e07fef7497394d0a1edab8127cdbaabfde335b03face6f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an effort to evade detection. No scripts were extracted, but the presence of numerous external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=maharashtra+police+bharti+2017+question+paper+pdf+download
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d0b23a271---77431850096.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210705_F6A19BB1F0429129.pdf
    • https://habibitours.com/ckfinder/userfiles/files/56746853654.pdf
    • http://ohana1bbq.com/uploads/files/22759405103.pdf
    • http://washchienluoc.com/upload/file/nawutaremetiragal.pdf
    • https://cottingham-group.com/cufiles/files/naxexiwuvudexibevotum.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094978708330---62659918764.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7296955f---62713863419.pdf
    • https://profix.fr/ckfinder/userfiles/files/kusebub.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5e1b7913d58617320183648655a34d67/nidaxipamewituzokuremoxo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ad59fbd3---polopiraxi.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0376d561c74e1ecd7b8b050680f98689/nekumu.pdf
    • http://rigdrilling.org/userfiles/file/95678295592.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/76665694108.pdf
    • http://t-p-fortune.com/userfiles/file/92259089942.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d602d81da8---wudenoj.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522093332184707.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6303276767---gunugovubowobalotosofigow.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/eb9d4a96febbf3c14536974098f9d48c/tidenivaliw.pdf
    • https://asiabiru.com/contents//files/jimipewaz.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/binufumixiwera.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_off0000d2e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 16792 bytes
font_01_sfnt_off0000eaf9.bin
bbef547b6f9569b03b67477c22fdd4b9445137608e9cf504c394d2dee2189fe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 22596 bytes
font_02_sfnt_off00012537.bin
d1edcae96ca44e3eadc250498e92969026cf098d3db121ba53a1a2dcb4c60c16
pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 11524 bytes