Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9f3950bb138853…

MALICIOUS

PDF

133.3 KB Created: 2021-09-14 14:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 90d6b41b736d112d5b3cc457d070e174 SHA-1: 64b6c3be1c2d8a64026e8b732034333dd8d53143 SHA-256: 1d9f3950bb138853fe8d79ae9eb81113827934b4663ea22956a87528a1063eb3
164 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=street+fighter+5+apk+free+download+for+android PDF link annotation
    • http://spbi.cz/res/file/xezuxarotudib.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/pukumopuzowepovubami.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/49762029106.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wudujepajagusuton.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/616292652d00254d8ef6bd2de8087bd7/8655833648.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b78ba0ef4fed9578e89c5ff79c6b10ce/rixife.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/56367594323.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/tukelexus.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/57446262443.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/51786744200.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/36177614532.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/83572395785.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/jusikokosogezisunuzi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/87129474385.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/91196326540.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/96670628978.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/kitufevebezulonewixigovin.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161360a51ba082---66377932745.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210911113756883904w63u7z.pdfIn PDF document text
    • http://medrea.ru/upload/files/wewikisavevuripipozurodi.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/vosabuburumovikifelok.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/23398963436.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_off0001a1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C6 10996 bytes
SHA-256: 9243b97d0ced5c396f9df0a721b83e35fca911d8d8524530c32236e3682b2421
font_01_sfnt_off0001bb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB25 19752 bytes
SHA-256: a6465ee789d90838060b7d52d4e0808be77c7558348e25938956eaac0e61e822
font_02_sfnt_off0001ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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