Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6f7ff8e5168eaf…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 09:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7b9369aa6c6ad3bf8625ece9b8217e9 SHA-1: 82dbd15f466a35f4f8c9f7285c1245476ad62baa SHA-256: 2e6f7ff8e5168eaf00b8515e4bce82d6d6153db0610983b925d18faabf395758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/c1jdaek61lu93kutlh6m43tlho/71495417673.pdf In PDF document text
    • http://centrons.com/uploaded/file/112065204060c7bc0cd273a.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c902ff017a4---76134441801.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/93540877273.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d451d7fcf6---latajerawoj.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/57979027987.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/94485667359.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/nazatefikefonisijabitusef.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/40129670807.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/pafim.pdfIn PDF document text
    • https://banghenails.com/upload/file/96226061838.pdfIn PDF document text
    • https://vitanov.rs/files/13892752602.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a8a63021b---lisisugofulosepedafinet.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xekoxoniwen.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/7428846352.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/nikefawivexotib.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/58086940844.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096797c1994f---dokalizupo.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6c4b18620bbacf73578fd7ef755ee2b7/dikadivafatato.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/fuverimu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e0c8e4bdfd540b128863488a5cb5b1a2/54757463183.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e71496ff9---ziramusakokitusemixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tecnologia+5g+caracteristicas+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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 15700 bytes
SHA-256: cd6533be89e431abb6eb91e5485f1fde53b2b1784fc3a1a1578cdc4a308c7aa9
font_02_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10892 bytes
SHA-256: aab16177439c09d977b1c2b3fb4b27f77f1af88ec92731dc523c04543adaf626

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