Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cf8dfb90635389…

MALICIOUS

PDF

108.4 KB Created: 2021-08-09 06:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6504d2a748fed79e73af906049a13325 SHA-1: 1ef9c729c73b7fef3225929d78f4e80a7374caaa SHA-256: a2cf8dfb906353891856cc3802e17901c9080c6526960381a3e66e830e23fd01
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised or disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alexdisinfestazioni.com/userfiles/files/64099000510.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160decc950212b---pumarasigosoful.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/88160762299.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b904cd9385629ab2e103d03be6075036/67547637549.pdfIn PDF document text
    • https://limsurempat.com/contents//files/bevalegemadifevij.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826667cb33b---xinurakitogi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/47694232673.pdfIn PDF document text
    • http://ndt-ultratech.com/files/jufegagu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/joxesapob.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/88681899432.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f98a24c28---kisesodabuvowuzi.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/tevabepidivodinusuxuv.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sadobevukavudexirelosab.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e3663f40b59b8ed5922a568cfdcba86/volonobulimepuvid.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e176cbb97---31017160423.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bc3fdea39---81482087834.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210805135256.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/kedepudinokipibodunal.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/b9iit3tt3fs0s9n6474n7iu4dq/58261827383.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/neviradeborefitixanekaki.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edebb6a8c0---kotuzoduleteme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+strategic+group+analysisPDF 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_off000143bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BF 17816 bytes
SHA-256: a7cd206b664418c3bedf9731d858b1be088b0d3b42cc68de980bcb333ec83f70
font_01_sfnt_off00017277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17277 10860 bytes
SHA-256: 947c27a40c5bf2baa58c202e61a9819c483cc733b29f11bbe2a69607738bb876
font_02_sfnt_off00018b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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