Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b7d051072447ba…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 13:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beb86deaacd07979234392b3b9a453d2 SHA-1: cd11ebc1c0594e90298102ab3589851856547c0b SHA-256: d2b7d051072447ba1ac87c7da642ad8838ca9a946047f870ec72b21e4257b061
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple external URIs and link farms suggests an attempt to distribute traffic or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c95defeaed1---gagepam.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/978a13e70ac95b02de3d2f20d1968729/sivorawuzetaporik.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d445f40d9ed43aa64685675ec52bf037/84351143320.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f03ff4f1271620ec907ccdfb7fa14826/kovukisikijajuwulo.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/62902703264.pdf
    • http://uco-kampen.com/media/files/64531525158.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a11fdb25b---87414667247.pdf
    • https://alamansyria.com/userfiles/file/91842968385.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/32996baa10dfd1da728812f98b97ec64/89041846274.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec9de2bb2---13600620869.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210528_92B3C4B9C60351D2.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1ca144d0d3313db4c8835de450bc87ed/rexolurotupodaju.pdf
    • http://childconnect.com/swi/fckfiles//file/sawexudububexegelu.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/6a0229b088ae805ec9bc4520b9de871c/zubezavabibazaniteg.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j0c19k1kn3jtcdivvkcs9em0c7/nanowopitutekenokalixazog.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3kt17qouv0ee68j50ot3dnd2sd/nozotapow.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143dc48e59---budanu.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/lavexijidewewo.pdf
    • http://plastikacz.cz/soubory/files/42191236546.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc6965d42f---zagiwagokedufazix.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743703f413f---pogifuzegujotimoxan.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607064b632eb1---nixasujakekulup.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/298a5729d6643437df12f24734ddc854/zorejawu.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a94550150---sigiwolojedujonigizexaf.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/403fd66adef9c47890631557f86f6b90/toxovebidekefo.pdf
    • http://vienhung.com/webroot/img/files/63626125832.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+stories+to+read+to+baby+in+womb
    • 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_off000108c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
font_01_sfnt_off000120db.bin
0492d7599ab7517a252c3d55a8113674d90a11cc00754c53d07329203261c3d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10680 bytes
font_02_sfnt_off00013966.bin
f5b0c7c6138d72b917a6ca58e069fa43168b7216508d889bec4f44c1edadc61d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13966 17060 bytes