Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fa90b34f6cffdd…

MALICIOUS

PDF

77.4 KB Created: 2021-08-05 18:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9f83be3d0ec7cc5a3bcc13d50f4f298 SHA-1: b1c16c62740f81901d30602a14b1dcc8f2a08b66 SHA-256: 21fa90b34f6cffdd5e10534a9923e47ac755861484c86aabbfc91e6a93cab01d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is designed to host and distribute further malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tks-forever.com/upload/2021/06/20/file/56961435882.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e080f45ae0d---norolavozenejogig.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/bigom.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e227e12f---14387014654.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b066e20cb64---99117385347.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a9b9eba169d18037ee82ffd05431fcb7/47609909860.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xizivopitudanakanobibo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9b9ba7af2c74646594c1f43d8b074281/giwidomeretapatuposunup.pdfIn PDF document text
    • https://aashianarealty.com/file/bufeguloxavevavuzafuma.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/bexeg.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/57414931394.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/3531479089.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a5653411---66580914073.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/9854916332.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/xatipojoxejolumuxabunewex.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94120302292.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607844bd8007f---56184737923.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/james.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/zexexu.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/jelos.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b0ea72285---jotinatuv.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tujinujakalaforapidaw.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4c4e340d0f24c1bcbf86f59d07a69271/61734981610.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/47763466040.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/91df764231a80f35d7a3dff1916f1e9d/bafugi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71d777665---seleliposuvuwuvipepam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=don%27t+mess+with+zohan+full+movie+in+hindi+download+filmyzillaPDF 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_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 16832 bytes
SHA-256: 3a859c75fc89b319073b5c76689b98795867f8b1db5bed3bfa45dd5fe8437cbd
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 10980 bytes
SHA-256: cd232d98e283f7f0dd808a176787da82c872f39d23ab614a186570dde4f16a2a
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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