Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4c51ecd93cd4aa…

MALICIOUS

PDF

112.9 KB Created: 2021-06-28 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c5279d162a591afa2ce1ef82871f2fb SHA-1: 0866d55bf639bc94e093a1192193efbb903dbea6 SHA-256: 1d4c51ecd93cd4aac6a787be634c27bc8f65ca79bbd5954a109c170a32d05435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c2c081dc---82480690536.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089dbfc5bba9---86964622201.pdf
    • http://ifa-astrologie.de/userfiles/file/99567400696.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j2sf6lg2id77d3r5vlbi60bd81/dusavidugewidigaj.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608255e34da22---73507070061.pdf
    • https://ive-cal.it/file/nunezukawitikotebejipoka.pdf
    • https://ludifrance.fr/userfiles/file/vogala.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6476fa5768---kizuwokazisetoxigovirewe.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m5603osvcqdk2b059mg8ls1mt7/20587969819.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac119660b49---zuremaxofajugatidibar.pdf
    • https://implant-drill.com/userfiles/file/92143171239.pdf
    • http://tantusmarina.com/UserFiles/file/pilubuwufo.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1csqpr2j9s7sqm3qlh8ltonrhr/gepamuwuzit.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/50326f9c3141eb94a3fb5a9897169ca0/63696712829.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacf337686---zegilekiz.pdf
    • https://jetaime-shop.com/files/silubukoneladujuzexik.pdf
    • http://hy-concrete.ru/d/files/meworusezexavuwuja.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/gejugasom.pdf
    • http://katheran.com/clients/55933/File/kobimaweredebuzawavutunib.pdf
    • http://schodylux.pl/userfiles/file/20298185689.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/5144369508.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/56344849458.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ac747eaa0b5d8b84343d3281e428867a/pozasoluwiwemaxibelebebu.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ddf26f1990cbc92ea7e7b6f53fdac2dd/28446978868.pdf
    • http://planbmedia.hufiles/woxelezusu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bryant+furnace+installation+manual
    • 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_off00015102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15102 16792 bytes
font_01_sfnt_off00016914.bin
a8b63eb542a36e3712e412196cff5b31b83f3d12499e2882bca2d9473c6948af
pdf-font-stream PDF embedded font (sfnt) at offset 0x16914 20152 bytes
font_02_sfnt_off00019d1e.bin
ea90fa7a249160303dcb67b47b1c6109d4ff4eea135153c001001418127ce88e
pdf-font-stream PDF embedded font (sfnt) at offset 0x19D1E 10764 bytes