Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa4fc71e92451ac…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 12:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c81411d73baf60cf3bf729039c8fe803 SHA-1: d50987f734b7cbc7223429c3dc02b6866cc99d4a SHA-256: 6fa4fc71e92451ac4065f6ca70d8bd6e48ed3c29d8e924e2ec0a6a4b6c04331f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external resources, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to distribute malware. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bgindus.com/t/tutorfirm/uploads/ck/files/45908940147.pdf In PDF document text
    • https://manenshop.com/upload/files/xijumepopobasonovo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f6305f9a---nibabejizel.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/taxugenuleguwumol.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904061553.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/zevemujepageboxenizetiru.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/bexixekamapato.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/busujepofizinemun.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/3o5iomg4noouobbn52o9q7ngd0/21537694000.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161331142cf69d---22767774716.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/nibubinekugaseminolubili.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dejiguxa.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/19223149245.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kq9f90ionud2eu76eoj1jf1f52/doxagodokijok.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/39596112002.pdfIn PDF document text
    • http://status.cz/UserFiles/File/depuzuxewizel.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2aec738c---toripivejojibol.pdfIn PDF document text
    • http://maxbrio.kr/files/files/vefok.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/gefarilametibizogikaxe.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/21498879902.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5528de07ae31c4050043f14f8d3e10cc/68044218812.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210903050103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=python+crash+course+book+pdf+freePDF 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_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 19140 bytes
SHA-256: c8bfa79f9a2c8cdc3e124d9185595e3cceba1ba8e799f8a818a300a43d8b5312
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 11024 bytes
SHA-256: 18e24ef689a30fc90a1cc19f435511ad51a791b76281ddef080cd5b7612fe612

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