Malicious PDF — malware analysis report

Static analysis result for SHA-256 be24c87f68150e12…

MALICIOUS

PDF

89.7 KB Created: 2021-08-01 00:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dbe2187d2aea4e4e2061addb280cc6b SHA-1: 4dd7315581ae4e6ce6a3ec0fcbd004c9c6c82f76 SHA-256: be24c87f68150e12d2e8d8aab22314ce39d452d318248c27a8b31ca2fe5b59de
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and other domains, likely to host or distribute further malicious content. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is designed to trick the user into downloading an encrypted payload, which is then decrypted using a password provided within the document itself, a common tactic to evade security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5517ea552---fefiw.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858c659e7d---12310707148.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/50584657431.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xesutagixanazija.pdfIn PDF document text
    • http://wamer.org/userfiles/file/12766830894.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f58329ffc---letirevawanebotem.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0d0a0beb1943e25980f65428168d4c50/gikalirikopexisotolaxa.pdfIn PDF document text
    • https://penal-garazh.ru/files/45600923499.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/refisosanozexuxad.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/25238516054.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/87828334679.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9915af46---bavizimin.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bimadokubelafakaderev.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/rukipativa.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/nujeluwaragafewarununewiv.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/savirokaxolusozupegiw.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7bgjegosnsnqc2430qq5222v16/tajonel.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57a0236ed---62548889663.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b245c53d7b8---vepulekeli.pdfIn PDF document text
    • https://irrisyst.eu/files/file/11556698696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=stellar+ost+to+pst+converter+serial+keyPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 16188 bytes
SHA-256: 5826768d51e878a18e97ee7d9faf41e3f95119d9324cb9073f73f54acecd1f28
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 19308 bytes
SHA-256: a537d791ec7b958fd0cce0f3bf59d8367a6ddcddda432996b4cb67a02bf66a15
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10712 bytes
SHA-256: 8586068c99f821840ecb26a7a5599cadc6e00ef0b7f44305aaf77304346113a2
font_03_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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