Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9b25cc8d846a13…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 19:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78278fbd731054dd4e40da641c1495bd SHA-1: 9651537d8007114199fa5d9799aa40a58982bfc8 SHA-256: be9b25cc8d846a133d20c9709c7d1d6b0e09294e00bcbd1572ff793dc34b9a8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://ambient-interier.cz/files/files/xagoreketozuburip.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166483b216---jixejalebanawetijigorekox.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c018e573e---55426751423.pdfIn PDF document text
    • http://www.asslar.de/downloads/tedeb.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/kurofozabovebed.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/82042084600.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbcf1f0eb---peketimebi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715e99429d9---pikaraxorabekoridegoka.pdfIn PDF document text
    • http://novafish.it/userfiles/files/91831167012.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/65709184566.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebe595114---xudaveroxow.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/37655248784.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/desukepulupisawolabiwovab.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/reniroso.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/beluxeviwulegedugal.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/p0um14teq0pus6o59lf8sl0ds3/buvor.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gimewasajadumeze.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/magugomu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/4139165275.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861206a2b18---75776742234.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/h7ov0imh9hufnprb862i5t1ff7/44942727738.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/m1f30s0k4renf3gg18ca0440u0/jigaxobida.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16093451b1fb5b---93411771662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=inorganic+syntheses+volume+36+pdfPDF 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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 14304 bytes
SHA-256: 2dae609419ce306e53576cf78a19488799d29bf2b82f214a43862d29f17fa022
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 11640 bytes
SHA-256: bdc30d51fc9e8a0f02a49cbd88c747eb9454539a3a51d618eb53ff75d1010460
font_02_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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