Malicious PDF — malware analysis report

Static analysis result for SHA-256 407486ac16c387dd…

MALICIOUS

PDF

83.7 KB Created: 2021-08-19 11:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 964cba4fcd38c818ad6d20757f68fb9e SHA-1: c63f8e297344bc2be061f8947ac7beabf843da76 SHA-256: 407486ac16c387dd6166a8e8f92d8544f78648de11977b6c0fbb0436afc7a8e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an effort to obscure the ultimate malicious destination. The embedded URLs and the heuristic findings strongly suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wsm.hk/images/uploadfiles/file/begufoguranofabakanefaf.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abadece1862e54f320bf5e6574bbe2a0/lubanizimuninutuliluke.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/007c1a4e9ca95c331b63937dcf3fbfcd/1928446043.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vc1s29451sggoalkn2r5h5e0n2/rekedes.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/53565372330.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75280c55a7---zuwenexubepepomixob.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/08ad52f74f1ea15554f4b7e73e56e273/golujixonusagaz.pdf
    • http://rexant.by/upload/editor/files/wogotoxasaposivipajixifa.pdf
    • https://hoakhanh.vn/uploads/image/files/52897361605.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffcef1df4c1---75190693826.pdf
    • http://brlairport.com/images/file/lowurivazijoruzaxuluze.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227048351d---sopobapavedix.pdf
    • https://cincia.ro/ckfinder/userfiles/files/xoleli.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c351e5330a45e1e21f0cc13561052d84/69789532146.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0ii2s12pjsamrf7uhgh5uarcr3/75053236337.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071a77ce6511---nanamigumalowapo.pdf
    • https://twr1115.net/files/fckeditor/file/lipidawuvaviwebogul.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba83d9c8e---wavofivefew.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/fujifoluv.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160817d737637d---19217317921.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7be4ck5qb76kpl8ildrb7ad22n/78916164663.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0def83c27afb7a3f4c735ef1decb2989/xoturofasobe.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ff26f13234329a45e6dd13fb27f62001/12467258409.pdf
    • http://barsugo.com/ckfinder/userfiles/files/8135461297.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+snowball+symbolize+in+animal+farm
    • 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_off0000e4e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 16792 bytes
font_01_sfnt_off0000fcf3.bin
aa5b7a833475ab4de50d5a20ea9dc6cbc5cd6b41f2f7b5ed3c4f4b605372e8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 16548 bytes
font_02_sfnt_off000127dc.bin
2f0280c8a3a97dac5e2c3962298c628692e44ee4c50c1573e6075f5cb981fd02
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 11012 bytes