Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fdc2c183968981…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 03:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c4e9c16d6f6f5cc4c481ecfb7488fa9 SHA-1: 1ab3d6eaba1d637ba838ab5b4cdd8963aa915c25 SHA-256: 55fdc2c183968981b5bbd4f31cbe532b1523d95b1c00bcb97df6ed28937a2cbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://synerhu.ru/uplcv?utm_term=yellow+wrasse+for+sale PDF link annotation
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/91a94t9hrfp44h4dvpstg2l374/89781559161.pdfIn PDF document text
    • http://fittbike.hu/files/file/puwopumogudi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0b29e981---68577733660.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/gixusanugevolajigerugu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/waxeluwipoxuxopavi.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/29396940066.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fa99fa30---45015450273.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/57379935696.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e95110e8a---56505777473.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6f174ad3---56947433373.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e2bebdd3f247302f9d29fa3610b230de/45240442213.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459876e4e3---vakakevi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb0aa0622---puwiz.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/39633180103.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c532e55ccf9---93371541235.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3ae29f25053f9d9604493cfdfcdeb085/86316243855.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74c57e944---menimiworefitojoterawepif.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/74672535074.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/db8bbf0qcrh4ir00hjc0sj0ghu/31564656457.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fokeporawewaxuzazidanaku.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j0bs82aeeu5mu18pa8d6kdnpp2/fojivozobosolojikojatino.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/58369765588.pdfIn PDF document text
    • http://congtyvima.com/images/Download/xexatopan.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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 9980 bytes
SHA-256: 78ea6eaeb56f88c10b2f3acf5b96f277063116df7e24741f943f8d68701d5dd1
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 17812 bytes
SHA-256: d5002aa7624752c21ee5eb475df8a02f80c3d30f783bd9b503cfa5ef8d20dd6b
font_02_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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