Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde91301af62c96d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 05:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2564cfab9e837794f1600626c7931995 SHA-1: 03e0e230835e78e732a4208ab2ba4fd4807cb3ac SHA-256: bde91301af62c96d30d488b86fc0bfa66ba0a175cd01e6246a8fea0528621518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thamdinhgiadaiquang.com/img/files/50472678167.pdf In PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/4087479807.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kesupoxajewarezabetib.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f066c292b---fajev.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/fafopeza.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/79397163824.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df0e330426.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fc164444539---54893088005.pdfIn PDF document text
    • https://deepex.hu/hirek/files/28211054192.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/1161650409.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/fumozamadikewiliz.pdfIn PDF document text
    • https://pellevah.com/upload/files/34609976804.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/0kd6vthvk84ar6q2fobp8abski/jifobokesamuwejo.pdfIn PDF document text
    • http://prestopc.it/upload/file/falasevageniwov.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/ledutosinijoliwixa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80bdedda3---77771920989.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096767c77e74---62504507466.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/43856747278.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/62789519497.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/12075133212.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160982a80a685a---rebejuvamerejib.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/nibegit.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/voxufitejivawimutamabuzup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=salitang+magkasingkahulugan+at+magkasalungat+worksheetPDF 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_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 16668 bytes
SHA-256: 76053037699ee2ee7a5a0f212fb6da0511dc0b3135801a85cfda36ffe4304327
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10908 bytes
SHA-256: f16de2ed49527075747d43efa17307b8da9fb6e4f62661c1b378331af52c0d23
font_02_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.