Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5719fe976f6aaf…

MALICIOUS

PDF

90.9 KB Created: 2021-09-20 19:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0204eaaf8ed6650b8f3289ddb7e4f424 SHA-1: e8adab6788b14110b3deeb680c68a98792b9af77 SHA-256: 3c5719fe976f6aaf415c14a3320f37297caa991c4e9d776c073e6d3188735b8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm pointing to compromised websites, likely to trick users into downloading further malicious content. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to provide instructions or a password for accessing an encrypted payload, a common tactic in phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0983e8ec4c5ad613c1b2d0b6af9bc0d8/tovuwuzizadedo.pdf In PDF document text
    • http://mextro.de/upload/files/xusivufepatigiruvu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911034858.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/luredigaberud.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6dbb22afb4752c4f39ec02a72dac0969/pogoxogipufezibejod.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631137491.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/debalipiv.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/85290532126.pdfIn PDF document text
    • http://aven.su/userfiles/file/xebegomufu.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/xikerunujo.pdfIn PDF document text
    • http://stattus.com/assets/file/3891705046.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7c9dd8ec8a2ff9ad400c9701a0625d55/29107630636.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136d390d52b3---jerawijedogiretexemitixum.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jesoxileradekuwitelan.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/50062166531.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/89929510540.pdfIn PDF document text
    • http://limoride.net/gallery/file/dixig.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58b4445d5---gobokolajuvaviwex.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/dufivadajenujubiwi.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/86560323286.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/mamef.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/48248183005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+hack+into+your+instagramPDF 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_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10884 bytes
SHA-256: c75ab223af24836494c84114edc2efaa34ff550d78665e2aa976d60a4044021f
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 18716 bytes
SHA-256: a076fbd7c11440645de0daf88435e1ca4f5163f523f8ebcbd635454c5956ec01

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