Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb1bfce2c1caea6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 02:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e68171f618d238ece82b5261c1f2798 SHA-1: 0819ccb34b4bb8dfa7997f9ccf7abab316d18685 SHA-256: cbb1bfce2c1caea687a600408e64771f4b3f76a26cc79d094eb56eaefb5696f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, forming a link farm. These links likely serve as lures to download further malicious payloads or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=how+to+make+custom+icons+for+android PDF link annotation
    • http://veganogle.es/uploads/ckfinder/files/18102162120.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/taxogavexud.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e090075acd222cc087f64da50c446fc6/38277127357.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/55e9e5fcb26ed1b6786cd83249a6d4ad/vogedugunatodenajukexon.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/76239510979.pdfIn PDF document text
    • https://ikima.fr/uploads/file/70300310314.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/govejejudusevov.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/83018483016.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jevepolivat.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614698e56e79f---romisebamefaf.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/sotefowubipegapagebojadav.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/27376631428.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/33683614913.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fcafb80bc---xexijofep.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/20126797236.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/mepejefusavidirug.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/9936276427.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/xulurovofixolowi.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/76344936291.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/44237582813.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210914124511_531563138.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/tinodumixipopagusesareton.pdfIn PDF document text
    • http://holzbau-napetschnig.at/26709123716.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 19312 bytes
SHA-256: 88bd9b27bc82bdc073811a565fc8f65682a8ee5d5d22d2b8c67918dacf2ec3cf
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 10860 bytes
SHA-256: 1aa3737383067f645046dff108ccc0176dfbce06c516df385cfa31e4bcf39712

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