Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79c47a88bc7a37f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 14:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff1cef941be93920720a82c851454e43 SHA-1: 9c6a01315aa68d40e90c8995976b21b6cfd0ba66 SHA-256: d79c47a88bc7a37ffcdd1c977e08b5d3586ae001d4c44e8c70309ac7789e64d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://daindnc.com/fckeditor/userfiles/file/87607580300.pdf In PDF document text
    • http://oilmachineydy.com/d/files/72817649305.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100845483465.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109232109514101.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jinesolewadibelina.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/68356857564.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/70012379926.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9af8c1ecd---20771722141.pdfIn PDF document text
    • http://email-database.info/userfiles/file/raxipetadiwij.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161334a39ed67c---63202077080.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/11532781461.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/49056275509.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/fekulemel.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/64730216845.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210903_42A86CEC78431AA6.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ec6185a8ce0119732b0aba6590dffbbe/88868061126.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/12084416971.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/59188267641.pdfIn PDF document text
    • https://datawire.gr/files/files/90029332660.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/tatubufep.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/juruloz.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/41477428841.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/28461173469.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/9537529810.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/26995710613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=larva+heroes+2+mod+apkPDF link annotation
    • 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_off0000b4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 10552 bytes
SHA-256: 80dc5a1718f5328c8eac0ea3bab6bb12eed0b12ec3bdb90ecde616c5e351c712
font_02_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 17604 bytes
SHA-256: 9f0cebd301090db9bfa0e99ee5f7fea358eb414e3b421c3e154023ed8df2da36