Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31b0da3bd42dcaa…

MALICIOUS

PDF

78.9 KB Created: 2021-06-30 09:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 732a51246feb1ab0dfe2010781edd3ca SHA-1: c1a767501da8477a4327437a8f93ca6171143213 SHA-256: d31b0da3bd42dcaa168870439822165c4ae56eefe5a783d542f1667ee9e332e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://archism.ru/uplcv?utm_term=opposite+of+passionate
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d7a83eca---75041735849.pdf
    • https://eletvital.hu/uploads/files/1257707168.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ssi0s6j04hhg36r2fklr87fmd0/fixijifufu.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/bjr6kfol2n0l4p1oa8cv9kls4r/95003753345.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/shpoqm3faieme6duhfctdj56gk/diruvo.pdf
    • https://trimix.bg/UserFiles/File/34406655471.pdf
    • http://musorcentrum.hu/files/article/file/vatagenejepidubepufip.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070811c11bb8---76385880244.pdf
    • https://anthonygillant.com/userfiles/file/xovuvawuxetegixuzojuvod.pdf
    • http://fujavietnam.com/images/Download/76358459514.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/53827196806.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc4d8aff4---62013997530.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/9712608589.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/486055d6a71f7efd4c2a5504a56fc8fb/wujutadenud.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b1a04f10---10228612157.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096e714f2954---94794409809.pdf
    • https://hosvagyok.hu/userfiles/file/63358893710.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1min7d8oi0eo6fodubdvosfqd0/50677356309.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2319089c6---nivezefewuwijiwaf.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f81ff4ae648ee05d0fa29de1b7cf25e8/molosu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f35c0eff56b258e01c010a346e60fc15/52918847384.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05957c2197e6f8dc33aff4a6bfd3b0a0/88711713849.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ff68d152---2332217826.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7q4j1bstq648vbgme9691abvrg/67745321055.pdf
    • https://karinbentum.nl/uploads/file/32411072701.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16946533345.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd270b6eda---pisefezorepowaguzu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvom9sh1l8kh5t9oh8levv2kiq/77366848325.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_off0000d4e4.bin
77ea5fdb1fd22df1665be0b9f52ca7f4b97e25b1c66607ef0d6bd69c1fed42e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 10232 bytes
font_01_sfnt_off0000ec08.bin
f48a4696633c676150a2bb987dbae49959efc79ad60d34dafb60edc126a3bfcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16528 bytes
font_02_sfnt_off0001166f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16792 bytes