Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced78f49bdd89caf…

MALICIOUS

PDF

72.4 KB Created: 2021-10-01 13:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fb9b39617b646ca33ce50a34b14b7ea SHA-1: 83b326a203a83296464496ba420157a810e587da SHA-256: ced78f49bdd89caf4f9f83d98e725cc777656e52c0487e620a49af11c3ad8305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=print+screen+galaxy+tab+a PDF link annotation
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/29506177883.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd40e9cad7---75376986471.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fijuwedojaxoxafixidupopet.pdfIn PDF document text
    • http://servmed.net/userfiles/file/wozidizevelam.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xelibofe.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a4198556bf3558f0f1e7d439e868e24e/xuxibezidazor.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fawudetuwixemixaj.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/31939558180.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/63247873952.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c2qh9rk90hr4pfgir0or5r24he/52360356212.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/tifarijeriku.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/mererit.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/futosujefafumij.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/mexunuvezivinetodawutuzom.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/93180442054.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/kixasujuzuwewago.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/53977811388.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/22021554282.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901095549.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340071c54bc---fapodevabujebu.pdfIn PDF document text
    • http://baoveantam.org/upload/files/suwenetepokokomus.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/95065395315.pdfIn PDF document text
    • https://primer-spb.ru/files/files/zodufasanelotenipav.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bisimuxuzafuvasenupazopun.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/sovudonipezazadapu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/58729081655.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/53673395835.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210922000603.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_off0000b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB628 10644 bytes
SHA-256: 808659f2123122f26e952037182b1364e13b3b6df72b6bbb58742d667e52f001
font_01_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 17664 bytes
SHA-256: 6b94d5b2f6a225529e00120898bd869e9a2b45222f520f64cb2447885bd55e72
font_02_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1