Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c5ed39bfc29b1b…

MALICIOUS

PDF

93.4 KB Created: 2021-07-01 21:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84214fd0da8c4853e825fa9825c8b875 SHA-1: 6341ffa833112d9ee9b54e5a6e4cc3ab0497d198 SHA-256: e0c5ed39bfc29b1bf74ee7edef55eebf41a61342d7087daa5214b8e24fd59181
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5412f173ba9543367e3ee9987f93dd60/liliz.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb373561196---kakixunupijoramoju.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/01ad6160ad29b0493e999d30ffafe49e/kubuduranitatotu.pdf
    • http://allaboutdowney.com/userimages/47217367128.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/64359492040.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad002462a92---teseruxasaz.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/de2ceed923512be7f0e44352066356ba/2962366579.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abd9ac165---6082335348.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5889a0ccd---87195724376.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/gezuwopekemeb.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/68655f73f4e0cc7e39fdfb5df3e3d020/47887752209.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822cf713793---16567931759.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0274273e0---filesulasod.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8afc892e---79090989717.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd8c6e83d---21919466359.pdf
    • http://sparkpro.lv/content/file/loxiwomaben.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1139187964609ed77f55d4b.pdf
    • http://adams-gold.ru/archive/image/file/xixapasijosaxibisa.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/426e01c1052ac97c151551ac5a32d070/tilefosiw.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b765d41aca---69846458763.pdf
    • https://cissud.com/uploads/ck_editor/files/17998709942.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/be39e0d19b4dcce1f86ef06114dce42a/80952501076.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=english+comprehension+books+for+competitive+exams+pdf
    • 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_off00010449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 16792 bytes
font_01_sfnt_off00011c5b.bin
80082e46facef4a6adfe662e672480c24a0bdcc0230e020004e63a0bfff5826d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 18068 bytes
font_02_sfnt_off00014ba5.bin
17f72556439f77c0904845a6b0a9e25b01153c8cdff96931215faa06a1dd4d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 11448 bytes