Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7999b3a64e3440…

MALICIOUS

PDF

85.1 KB Created: 2021-07-05 00:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 449314fe2492e6503fbe23dd3bd0c303 SHA-1: 00b272a29f8cf9ed80cb3869cbc95349cabb044f SHA-256: bc7999b3a64e3440edb6abb96213f725334d2a4054931844a3f9e4ca1d1ee7d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The document body is heavily obfuscated, but the presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/523a78836fb41c9c473feb3038954211/69051001066.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/47a8aa72ba9a9dfbebb684ca57a7d614/76769958195.pdf
    • https://summit-christian-academy.org/scauserfiles/files/38738558811.pdf
    • https://serwisnawigacji.pl/userfiles/file/kejuralasezawepu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r2iaahcdurvmaeu82uu4740slm/bizoxobexopesoz.pdf
    • http://hsound.ro/images/custom/file/zatomafozasafidogu.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6564afea81f8e4a15a39ede0c7d48221/57381855516.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/skbcre5sc81mpjfkfhtj9hrgsl/gaseriwosilagopes.pdf
    • https://rent-1.es/ckfinder/userfiles/files/48128579786.pdf
    • http://france-ex.com/images/blog//file/fifazomekireji.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/54912850600.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/73487593032.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4db36cf804588080d7978386fdb7c2c0/dezosotukedip.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d783f05d59c---55791940665.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210630_2081EC1E9A33F5E5.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4rb93g1uom8d1spvokgghdfaf7/vabel.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/5300b6d8759d97d832259d7b18302b5f/53678276157.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/72015325371.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082551cabbd5---76623269326.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ecb415eb80a6611a34637704d369a232/pokigabesuvizoxudipa.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4f888b950169dbfce3e1b1bec4f77249/zaratumajepa.pdf
    • http://apcmagon.com/userfiles/kovurowow.pdf
    • http://ozari-ua.com/files/file/26858677099.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/8517924622.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9f687b0d---kujupixituruxojetif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=causes+for+steering+wheel+to+shake
    • 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_off0000ec77.bin
3a7d227244b6df2f2a4a767633d74dccbadbd714e023e1bfdf5ac9d931700bd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 16148 bytes
font_01_sfnt_off0001162f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 16792 bytes
font_02_sfnt_off00012e46.bin
6aa0bd4e54563c8d108bc9c0647cfbc03d3d7b0ab616cf3e829a51c9e917d44c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 10804 bytes