Malicious PDF — malware analysis report

Static analysis result for SHA-256 d460f4ea77b7de98…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 13:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49214b9e0b7389d5efa0ccad29c14348 SHA-1: f2980da0b360218b5d83e1fac31a2cc180e1bf6c SHA-256: d460f4ea77b7de98afa4b2d6edfaf5d529872bfb8b40db7b59af4a9f5c2897f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/be8de534c1767f63757125e261a0f082/27291194155.pdf In PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/62954009724.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dc339101---walatezasanorefis.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/42754558611.pdfIn PDF document text
    • https://ags-car.com/upload/files/ziruzoniki.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b935fc70f49---80259579904.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/60601087285.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fekukopagij.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716aeb3da22---nolawipewunagu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e35f228fb53be5d8b9bbcb7aaf88dc05/jijuxagasibidoxi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4718dc799c---xesanefede.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/86879945120.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/parabutiwinokenirawiw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1ce80f4c8010e989e36113ca593995ed/livuvobigexunufiwavuzep.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/palinumefiwid.pdfIn PDF document text
    • http://www.asslar.de/downloads/fezufagerigosuv.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc471b81c9f---xagenowavaluxam.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/tikuwugukikituga.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d89c341490f2bf0573b9ddd395b67b7b/29511671455.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/71486655025.pdfIn PDF document text
    • https://cartolmania.it/file/sasepamunaveliwopoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=owners+manual+ford+fiesta+2004PDF 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_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11048 bytes
SHA-256: bfdfddfe949a3c9fcbe6d08c3bded42d812d7a6022c948aec9f25d2d648feaa5
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 17368 bytes
SHA-256: b0f93773e10020ae7e7eb05c52eb3d79251ad3fbbbdc3f9ffadab6a18e8259d8
font_02_sfnt_off00013bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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