Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe3f7e23c13ede0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 19:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb404213662b9934adb40f065e9e4447 SHA-1: b5eb19d979120ee563d42c9128cbc913dc41ff44 SHA-256: dfe3f7e23c13ede084591f44506fae0abf812dd41b3fcb91aeb0a252d223fc9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, a common tactic for distributing phishing lures or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest this PDF is designed to redirect users to malicious content, likely as part of a phishing campaign.

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 https://laborke.ru/uplcv?utm_term=peter+rabbit+2+hours PDF link annotation
    • http://jinanxintiandi.com/userfiles/files/fotitasan.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/wofaf.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/selupuxafifubuxinaradix.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/29362275805.pdfIn PDF document text
    • http://belovosushi.ru/files/veraseguzo.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jamigukudutuwu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ofg9iv59d6i4edops184nteu8b/besoziboma.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/50124291299.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/9707963964.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348009aeecf---84918478615.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/19afbbfac3685e88298d9dfcda469c8f/12340956531.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jepixam.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52b2f7b7b8dafa63347c4c9d5127e913/80453332066.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/58919500705.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/95333133320.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/40053630178.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1caed117---31003782878.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/06b24ef50ebee9c365a301d2f97de2e9/gojesor.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-17/images/files/79142493701.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/35327157124.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/39474219768.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/1401207929.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/16161426176.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/xotiselu.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_off0000b850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 16664 bytes
SHA-256: 298c7d951adf115627023bbca9b164b5290cbe77a97dd13a28d8eb67b6f9c810
font_01_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 10416 bytes
SHA-256: aef4965a22c7642ee576dfdf7cdec839b9a44dad710512f15408043a8b22d4ec
font_02_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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