Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8bb0c84954d827…

MALICIOUS

PDF

81.8 KB Created: 2021-07-26 11:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d5948239b785f2501e9d2e908a2a6ec SHA-1: 409ee2b26e28a8012bbd962695aefc6f955de1cf SHA-256: 3f8bb0c84954d8274fc00f83614fe2207c104bd231b5152840e487957bc2f14a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27e21cdf3afa0b62a5a30b0fbbdf247/41522263356.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3368f3a364---gaxijujalifan.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-24/20210624015630904785.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/jetapupasujar.pdf
    • http://burchiellati.com/file_fck/file/sajavufunegasizu.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/57688193729.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cf75c3b8d372fecece3e7c04a335ef5d/62739434074.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p4732m6h5tohe3cjimk2bo6adv/89048031621.pdf
    • https://cowichanseniors.ca/userfiles/file/lekuraxubamisefurin.pdf
    • http://thsport.dk/ckfinder/userfiles/files/60377023840.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0b207m4mfu71vj84nr0hq5aud5/76156950595.pdf
    • https://mmszke.hu/files/file/63891216781.pdf
    • https://zivotzaokny.eu/res/file/sexuvonafo.pdf
    • http://www.asap-recruitment.net/upload/file/sofabatinibaramatumat.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/855c655894e4422f0b460c5424888ce6/gukag.pdf
    • http://sportgalaktik.sk/userfiles/file/99707785264.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160723b27cc785---45615086404.pdf
    • https://a2designbg.com/userfiles/file/11688657130.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bebca0022c7c00dddd342e736c9da24d/47825281975.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/71721827131.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf52e066e---bezipe.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd7149419f---84900490891.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+free+worlds+in+toca+world
    • 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_off0000db0d.bin
13152f6ad3f6e166c1d00b642c557adcdf7c727e424954a2598bb685b9cb73d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 18092 bytes
font_01_sfnt_off0001090e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 16792 bytes
font_02_sfnt_off00012125.bin
2d57060bddc314c10adbf22c51df713bf0dcffb405f2500b63746e6290859b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 10728 bytes