Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed40df0c8fb85d56…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 17:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d14f56778d1f89a9062ce720bddc4be SHA-1: eaa5b29db327ed6b9ab6213bf9e316cfda2f4201 SHA-256: ed40df0c8fb85d5609f22e6b68b6f4d253cc2e4f05b4e446ed0fb097be13a628
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1294a0cd---bogajesuxiro.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/88048835575.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e575c0dd91---rokomelekuvinotubu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/wegomevosozujudojijajadex.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kufoturexasugitutivose.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/14969113336.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/tazafim.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/41237377401.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lawedixef.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae1ec6d4f---16852209814.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/pujupejorar.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2cf7a166---33143027289.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/14526323158.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/52200508381.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948e3b23597---10880845559.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/31822965824.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/9414899048.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/fugizinuke.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kf577dbf4qaln5lt3m8lco5mj2/75798385335.pdfIn PDF document text
    • https://codecs.ro/images/file/92034859928.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/letidepakiregepoxipalesa.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/30006985334.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1b9d5783242d4c6247e092fa2ef4116b/fikipefumem.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef8499a06f---48447888690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+online+crop+pdf+filePDF 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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 17152 bytes
SHA-256: 7e99953ef1dbb05d0bb1d1dde5e7786b4183dab5f2badf7576a063097836a0c5
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10160 bytes
SHA-256: 699825e3102755d484b0e1035c013f0d4be69a96e5e79eeff31fa44eb5ecc7ea
font_02_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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