Malicious PDF — malware analysis report

Static analysis result for SHA-256 8986b7017a4168b1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 14:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59d48f38e372a8c5814435622f38838e SHA-1: 7885d42d9ae2205c93168183e6a887d21eea8289 SHA-256: 8986b7017a4168b1c08a2ba9b5f1172380070a929211bd4a49d69298a61c2eda
156 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, as indicated by multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. These heuristics suggest the document's primary purpose is to redirect users through a series of links, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sys-svinding.dk/userfiles/file/soleturinixiduminijinepeb.pdf In PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/71837872854.pdfIn PDF document text
    • https://moolans.com/uploads/files/5504012562.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/surubadobabo.pdfIn PDF document text
    • https://e-room.co/userfiles/file/desixavepuluri.pdfIn PDF document text
    • http://saint-party.com/media/file/folikajipekefa.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lqub6kch1lmrmur3d13v70fi4h/16723284779.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/jefedima.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/91697974841.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/bd45d8f8203bf51d1111e4fd8c4cf9d7/zefoletimok.pdfIn PDF document text
    • https://gdaniec.com/upload/files/novumawuxi.pdfIn PDF document text
    • http://synfarm.com/upload/files/38407301659.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/xudovizoj.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/92588656095.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/pisoja.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/zurikufaruximoxuk.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/71707775304.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adf2009f9988f953a8c82e57aa747b87/56916214172.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/13721771981.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/97090250380.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kunafegimufumomerutakokoz.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315f1f8071e---10458453142.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/zuzobuderesovejonuxuxapel.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/netaxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tree+houses+to+rent+near+mePDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 10296 bytes
SHA-256: 32334b8632bea22f09e908e523d366926d66ee455e846e13d22f9c93ba7fcda9
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 16000 bytes
SHA-256: 15e2ab03f6f04aac9ce4319298823c65d297b076186d6256c92a22d1882c0c95

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