Malicious PDF — malware analysis report

Static analysis result for SHA-256 466c910586d465ea…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 15:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 134d259f259c1532a9c6d5c2652bca5b SHA-1: 87ffccfe44f747c57e702222538b8e80bf89da18 SHA-256: 466c910586d465ea723a068761af33bb9e73d211e24c531dfe70eb3bcc31c499
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://actorconseil.com/files/file/fulewokuvirilitenupafu.pdf In PDF document text
    • http://pm-ural.com/uploads/files/zijusadipat.pdfIn PDF document text
    • http://gibisch.com/files/files/maxovisawonuj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608294e8b0043---75983004041.pdfIn PDF document text
    • http://abwva.com/uploads/files/miluxexenifan.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89cce5500---59316613272.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/ruxut.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/lakesubufilisofujaru.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/joziditivesubunufalo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/29688eda72322c582cff58ffbd58531f/wodukifelivonulumuwisumu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/27291441365.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/vusekeferepuwesujapuzakel.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/pelalevanimivuwivewapu.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/92763770933.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/retutezijug.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/53714006591.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/depifikimilixujelumaf.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/956fefdb511ee3b0787203373f7951dc/gizipufesej.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/supegepojizipizesifevem.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lolukeli.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/24328443812.pdfIn PDF document text
    • http://goldia.cz/data/file/53520034897.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772602acc0f---giwujokanuxapise.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/49616747164.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3cce569e---67795442050.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160957dec3dc5d---lakib.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/53403870056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=libro+de+biologia+2+bachillerato+2019+pdfPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 11184 bytes
SHA-256: db1957b1807e3d8c818a0bd33705a625519a88a80a93eceb379c4536ab9a9519
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 19368 bytes
SHA-256: 255fd6df546b1c0634f3554f1164b0427f84cf56775d1d1979584a223a56ae15