Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad152edcef393362…

MALICIOUS

PDF

81.5 KB Created: 2021-08-24 22:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8427c3d93146963ab401a62d79549b39 SHA-1: d71c08a8d988996587abb1768522a48a722af654 SHA-256: ad152edcef3933624cd77ae2e26acc0ab457c26864104290964367dfdfb568aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=example+of+sop+in+qualitative+research PDF link annotation
    • https://podereilmontaleo.it/writable/public/userfiles/file/xogepasigokaxixawipi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce29e183e---bisemuzifi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b7000d91eb71544e4b018dbf1d9496a/79383211036.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/9147684880.pdfIn PDF document text
    • https://plasy.com/uploads/file/10852383528.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210708120832_e28btg.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/xokowufodek.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/setovu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d60290a47bc---74603857494.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/41891565304.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/93094605325.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1980f7cde109fcc08ddfa29f349aa881/17195490404.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lenovedosotanuripa.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/xifefiterovipi.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/9139023164.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/cd5fhq7e0hkdss0o4criaggp84/mudofefubabib.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/jufuxexorerakunem.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084078622ac0---78782950435.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/38198096086.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31a00eeec---55844410950.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/47702756330.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdf784f27---53019240395.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/75753390812.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 11140 bytes
SHA-256: 43b30430ca42b9fa91cecbb39474f2518c2456089dc5bdd746d6f14d5fd36503
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16928 bytes
SHA-256: 41044b5f1735a2ee668bda004d71742027204391be1edec536c9f01019817570
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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