Malicious PDF — malware analysis report

Static analysis result for SHA-256 256f489ed747e40b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 01:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14a46efb95a44e89fb0d53d4508d4969 SHA-1: deb34e621b28b4f9bea24196d0221a73ea44f775 SHA-256: 256f489ed747e40b0c81ca2d446e6b80bc7de69d7fc6ea345729b74b64ee43ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=redmi+note+9+pro+max+charging+disconnect+problem PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1c8f31fc051722a19e01e6aeb547b289/fiwobazegawowufufibuvun.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/95177658342.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/suzijavogagezozukuz.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/nulumakexaretil.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/wipadavurekifafejawumo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613211e8c76c2---nejijejigagamimitidubuf.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614128452e08a---90620387258.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/wugijakukiw.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/wemanis.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/si2n3if954oj7jkid6aa6jc0f0/borazixoteni.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fffe701cb---77866761915.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210912112500.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/93357805547.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/10905832191.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210911011107_gja0f2.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc1747213---mivukegod.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f1ddf51ad9e239e2e1da49a32be3a1de/nelojurisi.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/fopopiniwijulukukozeboza.pdfIn PDF document text
    • http://hzqzg.com/d/files/64920071544.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/23212633653.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/rabup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 17988 bytes
SHA-256: 90f8276083b04eaafc5ea75d27c79652c0a4e91d8fa7fa76fb990ce562c9151a
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 11416 bytes
SHA-256: d41f7e9f6e567859a36864c5cbca6bf019966fab7472b22d0078d6c4d97d58b2