Malicious PDF — malware analysis report

Static analysis result for SHA-256 60bec19b1fbdec33…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 18:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b590b88491fd0de14ded795afb71beb2 SHA-1: 4b7295ebd4d450fefdb46664da0c2cea1ff7e792 SHA-256: 60bec19b1fbdec33e7be869a099ed318f95185031863e0e10f354d2b57eb1108
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d5e37b92f722cbd6492d543316a6c481/60887743970.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607787e18ea2e---xovapebigesodevag.pdf
    • http://soupworld.de/upload/file/juwupubasuno.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/67475c6c2c68af97ec14374119e62a6e/79796728248.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c52098bcf93a752985e679bd6a2cccd9/76075778338.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e01216f8---56751989259.pdf
    • http://iccarrentals.com/files/file/55680533638.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608470a23a0c4---19931306953.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36637783786.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ac987e3d6f2efb87bfb38978c8c99910/nuniradugizurobereju.pdf
    • http://alhouti.com/userfiles/file/tafaferadabe.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a08d2d355---wimafuxoxirasusuzivipisuk.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d575433ecda---76399702183.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/682268c6d4b2dc8db7dc933310c90b67/jinano.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f639f98641---vipomevukerer.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c87c27564d2d8c8cd4efd884bca1fc42/93200286712.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/auufq7psfr9h3opqskd96grng3/29251079404.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/91948600213.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160979d686dbc7---2291486029.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acca84e405b---pidazowetunexumibamo.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5d536b7647e3b37e50cf13602502554f/wedadixebajobajirafijuwa.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a227335d074---muvisoju.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/77565645107.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=evaluation+phrases+for+initiative
    • 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_off0000f6cb.bin
279252f2aa70b197fd818b9fd6cb3f87beff1aa8bcb56a9b50d921dc833691e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10604 bytes
font_01_sfnt_off00010ef6.bin
a9511b49e0f073fdc99b32b227804e7422c69436c402cce9ed34176eb7859b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 16904 bytes
font_02_sfnt_off00013b17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B17 16792 bytes