Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5df333ffe90aee…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 00:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae8061fc5d7321843d8810cf15994646 SHA-1: 4214d73a1aab16543e581d48551f977da417ab47 SHA-256: 8e5df333ffe90aee7e26d06b1230ef3fe39261ca0b76204d615c4d5a41dcf537
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including numerous embedded links pointing to potentially compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=my+pain+is+self+chosen+meaning
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd4e7a8e75---27908190459.pdf
    • http://didocrosby.com/imagenes/file/94188492807.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/63fbe49a454d7616c79f44a9fa9d4057/26119999859.pdf
    • http://magendans.com/imagefiles/file/47319247865.pdf
    • https://giasusinhvien.net/upload/files/bowumejogurofaso.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607552ede4651---69738136840.pdf
    • https://immobilgold.com/file/bederofenij.pdf
    • http://smartvoicecom.com/userfiles/biwekimodexipixufepinevus.pdf
    • https://agentcctv.com/userfiles/file/winiveripugadur.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/de3ccfe9065f14a4fba90ca593a473c9/detebudipa.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092709ff27ba---vupekinukuxugiza.pdf
    • https://cowichanseniors.ca/userfiles/file/wajufarixogimalope.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec403f0ef4ca2bfda62e3ac86126a3bb/potoreri.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160754c8c1022e---xatagiruzozum.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609968a4b818c---nowanaxotubowud.pdf
    • http://ylgems.com/file_media/file_image/file/70370586315.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6b0c1b12---lukakebafavolutitewojito.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/38575246609.pdf
    • http://absolutelyneon.com/userfiles/file/negonevapoxexululat.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/77773316808.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160befba284d4b---45266256792.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/26177983508.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6dce8299---2864248224.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/rk84cbrck7p2svtbj05n1vsi56/11474069113.pdf
    • http://scamps.biz/userfiles/file/72371156560.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/03143eb942903831f6c8f19d5ebf491b/veputis.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_off0000f657.bin
21d47c5c35ca28c45c2c27821b5fa09ea5dcb59defddeecb58ebd6f57c5e3723
pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 16692 bytes
font_01_sfnt_off000121b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
font_02_sfnt_off000139ca.bin
f9330f85874d5b555336e008c4b6b0836f66453f29726248b5d785aefb1aa31e
pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 10836 bytes