Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bd374943cab256…

MALICIOUS

PDF

70.4 KB Created: 2021-09-11 05:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9db48c960e2b9b2bfa5104baf230827b SHA-1: 2ae4a6dac90a03e1cf2b4ae56e7f3d01514e8db2 SHA-256: f9bd374943cab2567a829e217104a03899d75820d7de2bb71a515e0e2c9e1fca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://phelieuviethung.vn/upload/files/46964394607.pdf In PDF document text
    • http://orikon.net/Images_upload/files/14920639213.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/gobugev.pdfIn PDF document text
    • http://mobiliteit.nu/files/gimetirizorifamoparixiki.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf4cec665---kilogutanoburisopodik.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/puvisebelonakulivija.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109080944511588.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/79722579378.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/karuzejasanogutuzi.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/84773755528.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/iro93q1cm7ufiihibc1g91g8e5/49070648932.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/bababaginogigodadosaboxaj.pdfIn PDF document text
    • http://askort.pl/Upload/file/mejoxu.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/ruwudurob.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/meponujasitedomekaguzil.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/8602669140.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81502877312.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/50248908923.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/pebipe.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/53770058167.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/37763410205.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/20106661823.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/76285705773.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/dozatololaliwodunizusu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rf8eodnd4sinq44ac9s3r26h0c/riwulideraxixavo.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/2777164143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+nlt+bible+download+for+androidPDF 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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 15100 bytes
SHA-256: 0b45a6f55f0e964c8f5a42acb46be1ebe6aa8973c0e14ed925ec050692e5a9d0
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10380 bytes
SHA-256: c09ba49105823797652d7d73249239ad00c567b90b6cf11677292070727145bb

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