Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb7e35e4e906b10…

MALICIOUS

PDF

92.5 KB Created: 2021-06-25 13:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8758a1500c5a6265af8785e7f1d89987 SHA-1: 2e9dea4c9cfc1b1ceac7895af463ff4464344009 SHA-256: efb7e35e4e906b10966c8d5dc31a21eb985bdb404bea25d158cc03d2bdfff7df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to an advance-fee scam. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/suzowa.pdf
    • http://birnagarcollege.in/userfiles/file/55126997878.pdf
    • http://remaining-mc.de/userfiles/file/70301381833.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dae781fc4---sotajilizaginejiragokuz.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd01ae5507---nabodikigodovubapuken.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/39pvlti79r74403s3mbbrhdrr3/befimobixubuvafenox.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8cc60f6da75ad52cfd6762186cbf0fc/84364600484.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abe7adbab---ropozivoribozakadoju.pdf
    • http://velocimapper.com//webfiles/file/tusik.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076403eab951---gupisumejarixigimosidik.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/rawafikibipe.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c798bbc992e---85773670732.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b10dbac8---demerazinabelawexedimede.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084cc10031fb---kosegapijotawisirogavu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n1qinqnqe9tmbcg3ll2b202svh/kavumoxexiwoneriwujed.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/22fe917ec0e524400446d487218f11a1/suwatokikinosanob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=project+runway+making+the+cut
    • 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_off000103b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 16792 bytes
font_01_sfnt_off00011bc9.bin
1c11ad6b356ad1914e41f368a03ae86a75978aa762134e2df00f684d6b0f9807
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10984 bytes
font_02_sfnt_off0001352a.bin
1d5f090f857873c486bc69989dfd80c69ea3b6fdea50064e557df1fca3e3935c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 17936 bytes