Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10053c15cd275cd…

MALICIOUS

PDF

142.6 KB Created: 2021-06-29 07:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fcd248fe2413876ddb540daafce06c71 SHA-1: 62f82982e21ee47d5d154159940b4b936d6e9499 SHA-256: b10053c15cd275cd13db00a8cfbc07a69faa871128deb0355b30ee8ed5a3e36e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://daiichilogistics.com/uploads/news_file/58066741574.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0c7a05d1a3d0e777c2eac51e528198e4/dumoboninopu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098a27197996---39222068689.pdfIn PDF document text
    • http://allasclub.com/campannas/file/beroko.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/80744108331.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092d75850dc4---88052597614.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/24291783217.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7a4f54faab39b2d31f6b16f381f26321/lepusum.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/vogenodujodidud.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/796c8088f91c07d85425854f96854635/2054407588.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/japilurevipobi.pdfIn PDF document text
    • http://alkanboya.com/files/file///falonav.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uo4u818cnqi7qfuu6rk3koejd4/87776445935.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/bujuledepasajisotewug.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/poxodutetuw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b44e13222e946f9c740148ccbf7ee781/87407549241.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5b202e305a2634f17c626a8ef2e75ea9/gedexufab.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0bc1919b6eccac007520dc36f88ea1cb/jimuze.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54aa0dd33---zipetofijalorijafoliv.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/dugafazadefuparoxibadu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d2d6f2eed3818ed53738a004b8ce3a80/digixusiwabofavefo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5eabe744580c56d702d14ba2ed36818b/gosimerivujumemevevuga.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f5b5c19a79051e2758159c31a1b35705/14812136791.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab1139e6e---pivudixamudadimegexeti.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ef8d426af---batagopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=one+dimensional+man+meaningPDF 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_off0001d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D019 10416 bytes
SHA-256: 8e2b0252c67f6d67e8c9a35a4552f59ae898301dd76bc7504f1fb4973b1d4287
font_01_sfnt_off0001e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E76D 17724 bytes
SHA-256: 38f9353b5fbe619ab76b9fee86463879b75be0e67c7e65e9fe329cd1b86d58fa
font_02_sfnt_off0002146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2146F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1