Malicious PDF — malware analysis report

Static analysis result for SHA-256 e255cf7314d49320…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 06:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74f7dcad8e8a9f11698b3390a7301a6c SHA-1: b25c51e558d3b8797b3485361b5cc6a674b37979 SHA-256: e255cf7314d493208ecd0b666dce2a87c34872302986d6de1e527de09e939824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dcf80c76---6670512397.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/712fc2a4852c3d5c77d5cdacc7e382a3/73432546578.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912a040bb0---36554356654.pdf
    • http://artdealer.vn/upload/fckimagesfile/c1128e66a5383fdab7c6a9e4456abc72.pdf
    • http://maskaevlawyer.ru/userfiles/file/59517126900.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r0us03frssvjj2ass3r9ranini/10155140307.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160803aa5382a8---zuwolos.pdf
    • https://rybczewice.pl/userfiles/file/10289910422.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e824c1691f---xuwilapafolubiruzuzutit.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937b58b445---lebumojajo.pdf
    • http://aylincinarli.com/fckfiles/file/18734948474.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/b9ture2g2sgmabj7be8c44kj7ivva12l/kovidifogenoxaxipofag.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a84e53a37cae02818204aef2e18d68bb/50555012819.pdf
    • https://menlopark.com/wysiwygfiles/file/kavarovutasilifebukagi.pdf
    • https://ratsimae.ee/media/contents/file/tumuzepalasis.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3f8acc39291ffe86b36d4e22c93092c7/2496257721.pdf
    • http://xiaohecollege.com/d/files/zipotonogemavesikubofo.pdf
    • https://banghenails.com/upload/file/kalul.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d280f9cc57---59180451968.pdf
    • http://asfalon.com/__files/file/zobomavatowete.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/e471f245a023472a9d6dd915cf2a4fb2/laponek.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246d669f8f---xipebavanadejonaxi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=odds+on+premier+league+manager+to+be+sacked
    • 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_off0000ec1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 16792 bytes
font_01_sfnt_off00010436.bin
4e81a09a9c1e314b80d173867064d5063557b7e1712d14eebd5d43471ccb5bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 11216 bytes
font_02_sfnt_off00011e04.bin
6992397193436f8b18ee7c35e19a25657693780493f84d9ab3be10038d63dc7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 17436 bytes