Malicious PDF — malware analysis report

Static analysis result for SHA-256 27184723d011754a…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 05:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e43bed6d22816d9ce838c73f0ebcfd87 SHA-1: 995ef22de1fa0d25da61fb7bd3f7b8992d00c703 SHA-256: 27184723d011754a4cd32a56fb1591e2909a335ab5b356fcca0e8a14e21744c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bestcoloringpages.com/userfiles/file/munaxowumunufexe.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb93a90c3---43867463228.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06ff345a3---17758075357.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n86bft6523e57dt9jevthifk0/11010459677.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607767fc35875---betib.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb2be99af---1018682964.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3b06e82d5---11247335265.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b9e1d91c---siwetudel.pdf
    • http://copy2d.com/ftp/image/file/21031314212.pdf
    • https://auto826.com/uploads/files/82819353129.pdf
    • https://coatielectronica.com/files/8064394661.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65cc64f76---99059944450.pdf
    • https://fanaf.comarticle_ressources/file/62563239182.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087d82cf79---robuxume.pdf
    • https://arab-hams.com/Ups/files/35391348212.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bfc24cf9a07aa357d73f3240d7e701a8/buwataluvepanarovage.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46fc587e7---12539838438.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/814mm9svbp7l2oqe17ar26pkkf/9155272222.pdf
    • http://nessium.net/userfiles/file/4909871915.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/j82k6dab94b3gb6peno3t0o1cr/febodiwodafurumugivoz.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210531_AEBCD13441F6CC5E.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nth+term+of+arithmetic+progression
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fa.bin
151bfd937a6d782cbb1e430a4473761620640adecd19660257622b720f18f863
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 17660 bytes
font_01_sfnt_off00011181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16792 bytes
font_02_sfnt_off00012998.bin
231f77efe7496fdb9e4ff1952d350f5bb5b36262ef10e0dbf36a7cce08b45c60
pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 10856 bytes