Malicious PDF — malware analysis report

Static analysis result for SHA-256 a308584cbaeb7f56…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 12:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bb463e49c82e03595066fbbdefe7f9d0 SHA-1: 6bf03e59203608318718782c0a6cabb143b3551e SHA-256: a308584cbaeb7f56490ceffc42dc00dd10ef4d781de5e077f058a9abc0fec798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://addsfly.com/userfiles/file/87492728270.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4759b360f---27166334496.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/depopuwenali.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd982a2d3---47294354899.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wemudovupu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/77461473361.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/76343561846.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/63275996897.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/sojemo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/58920008614.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f862c257cd96d79d426724a54f257437/disopaniki.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bec3e89e10c22a6385d973d0c64ff971/jikazixugo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eedad2250---6060630379.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7508ffa62357651534d66d15c6503228/nevojagubavuxumedukul.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1egjdfrsk7ka3f3ncb9js7fkq4/29774257858.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f3802dc6188373f195d1a44e979ce59a/95736069162.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/69246081111.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210531010335.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8a372d67---97424392375.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/59947024936.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c061d620d2---11841386731.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0500bbc49705ca639694599375027751/83472033727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=do+citations+go+after+the+periodPDF 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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17204 bytes
SHA-256: 05aab6ac3669059f895b86846a41ad2e7d879ed77daa3fa30747757e686d23e1
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10852 bytes
SHA-256: c4bd61b0df5d4ebc327079f84c2b3e2da8621f8c90658a86e6560278cccdecfe

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