Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df46c21133e9832…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 108b28864caaf8f8ad7596be198d0ca3 SHA-1: 6b19daa2cfe66b86d1b4c2ad02687afff86e6da3 SHA-256: 6df46c21133e983234bc3191728c83fb2c620c981d6b737d68108dbc49ab8d23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, aiming to trick users into clicking embedded links. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an effort to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, with embedded URLs likely leading to further stages of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=can+i+use+my+phone+to+control+firestick
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/32836694949.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/56221136095.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a193bad66---42278605282.pdf
    • http://lerucherdesanges.fr/userfiles/file/pususabuxes.pdf
    • http://wangyiphk.com/userfiles/6804945610.pdf
    • http://cuacuonbinhduong.com/upload/files/xedulafatonidedadames.pdf
    • http://samurairamenbar.com/uploads/files/57506030426.pdf
    • https://aaaxxion.info/images/file/96518395578.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2f565ea504dc3fbf04fe383bc9c464c7/jexasilif.pdf
    • https://rosenstein.lu/userfiles/files/pomatitiru.pdf
    • http://www.frank-diagn.hu/userfiles/files/24610938156.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/18194777904.pdf
    • https://essaidafm.com/uploads/FCK_files/file/63103262880.pdf
    • http://allefrgycg.news-read.com/upload/files/19521829141.pdf
    • http://www.hgbehringer.de/img/files/files/53586734981.pdf
    • http://rovitek.com/userfiles/file/73887584284.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b689bf3393---67993314864.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3040ed6cc---puvevidum.pdf
    • http://electronicaindex.nl/images/uploads/bovev.pdf
    • https://alev.az/userfiles/file/32513711723.pdf
    • https://psychologgia.pl/Upload/file/losakizabafedonikubeme.pdf
    • http://chonburi33.com/userfiles/file/tifedux.pdf
    • https://permargi.com/files/galeria/files/xibezifinipure.pdf
    • 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_off0000b01b.bin
ec08a0b7b2782575febb047a53e329b7ba1b9eb9937b9b44fcf94521c4f40f19
pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 11084 bytes
font_01_sfnt_off0000c9cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16792 bytes
font_02_sfnt_off0000e1df.bin
7c3c10bdb839a010b137a9cebd67ec3da40a85f44c052b4ce16dad000452d78c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 14020 bytes