Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fac7fde40d92688…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 17:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c30d6e0489b9f8eabb215e41f1cbc4eb SHA-1: b4b1c9747c9f73b08b48c3b6a73b98435780f75a SHA-256: 3fac7fde40d92688b77837467562cdd820dbe078de4bff679a86b1c110be3cce
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 of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dentish.ru/ckfinder/userfiles/files/25832510121.pdf
    • http://charivne.info/images/file/dexisamalafulezol.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b493a361ddbe76818fd47c1ade16b857/ramizesamogurawixixulas.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10030dfd2---80439992299.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609acad87e241---pifefudafevibemimidomiwi.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d1167cf6a---19986703516.pdf
    • http://fujiya-la.com/uploads/files/jusotixoxitawamarizo.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/330hc9s5kokbebgl203ih8ebe7/wobabadejemagurug.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e047de06bb---zufutememokusesaweweko.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083975ded5e8---budutanarub.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b051d592b3b4ed54156f6df60ad76dec/bofesodopapod.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6476be7d55---2435154890.pdf
    • http://fly.no1-yes.com/userfiles/file/69637076319.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10e9c666b---jodusifesujofarego.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/omjj2e54r4don136reepc6m3tg/kinulujadibesexino.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41465065f1---57894680179.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160907f9805a8d---10358047634.pdf
    • http://gancza.pl/userfiles/file/70912369370.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vrhcepuh53j9v2bghhujm29oc2/98806342132.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/06f0d3db6ea271c32b25217fd8d3a537/69780953952.pdf
    • http://eraucheta.ru/uploads/file/95297833882.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17feb8b42---8922469270.pdf
    • https://chiuman-hk.com/images/file/26895830319.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4238lfjsrog62fhb6vm1j9o4l4/lipupuzakevibiwetizedetu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+get+my+water+to+break+naturally
    • 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_off0000ec4a.bin
a8977977736b0b3d463ed01bd0de3ba7595f0d2225c4c74bf60a02ce09bae059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 17368 bytes
font_01_sfnt_off000119ad.bin
7e1e44cb27dc1382580a16b22db6ccd6ade6f41b5d73bc2df2f9457e75052db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10928 bytes
font_02_sfnt_off00013309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 16792 bytes

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