Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5941cebaa341cdd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 21:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 413546d2b9e2953b32d85b5864ce85e0 SHA-1: bda7622bc6f784dda451a8f12f1f901ac77455f0 SHA-256: d5941cebaa341cdd57e91ddf28082608682f0c3ed2b8312df7353d9b3d6652d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=save+as+pdf+printer+android PDF link annotation
    • http://geostudio.eu/userfiles/files/10361568682.pdfIn PDF document text
    • http://baoveantam.org/upload/files/vujiseveferefekax.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138cafe16c19---94195613921.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/6290965072.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/49156440707.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/34538245285.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/47057769736.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff3d6e8ca---84617506024.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_0657F2FBCC98C663.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/ratevajuwarepule.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/gotapu.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/rewadiped.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/paduseponifijanegupigov.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/donepujomita.pdfIn PDF document text
    • http://vpsystem.com/files/fck/xepusonotabelinedapomesu.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/5674093881.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zafotami.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/wavisexadofogimezeper.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/mibase.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d0848a49---53742543286.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f939a14b0d---8351735972.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136596235dd5---13262208975.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5c65b528---nivelidesiginikereremoveg.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/13492650731.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 17332 bytes
SHA-256: 286dbb7a79081ac36bc67009e250262c7a31935a80624832a94a308bcc8e7ddf
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 10584 bytes
SHA-256: eb88e30a7789bf126f9c2bf230182a7a8dd478ff8afe241900f6f13c421db5e1
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1