Malicious PDF — malware analysis report

Static analysis result for SHA-256 079d4b56ec56d6b3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 05:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6573def4add42b81756c24c3085c3c62 SHA-1: f8399de707b931f86eeac34526e9352eaa38766f SHA-256: 079d4b56ec56d6b33dd63cd96ba28ea5ca86a0ea2359a89d71e5987cec9b9f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=how+to+delete+the+play+store+search PDF link annotation
    • http://scard.vn/app/webroot/uploads/files/77276592280.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210914_070907_103.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb97c4a859---beferilewejobas.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/damogomojefazolozotiw.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a8e57add992534de556445696a829234/32894147986.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/87254434822.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/80164148779.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141397512cdb---17730221323.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/58479179295.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/gisivil.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/25266103267.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/fubisuratonotubi.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/lorivofoderuwoxetatimerab.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zubipusatovobudezajudob.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/sapeturib.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/53302738590.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/ginunotapuwugovubevex.pdfIn PDF document text
    • http://elma1.ru/!upload/files/68399050575.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21091119314049792431zu4.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/fijonobovifolero.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412350db414---pedumodit.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/30298276196.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e7d5476b---89994854786.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/lolawatodasazijoboguv.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fepaledefujotuxafagu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 17944 bytes
SHA-256: f0ecea3e97eef4da3d8eea3fa8d5a1344bf7305c3595b43bd8fd0827887e7c7a
font_02_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 10608 bytes
SHA-256: 86c133acb86e6efcd644fe943271f49035eaed0b54f7394e1840b60cd397d258

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