Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f372e2bba2c0543…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 03:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30e10653f38cb454bc37c308b71b7e6d SHA-1: ba2b0395853d317d7b1f2d8ace7be70e7a142aea SHA-256: 5f372e2bba2c05431f2e78da313f708a616708055620a40254568c927568bb66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=plants+vs+zombies+2+obb+file+download PDF link annotation
    • http://anapro.com/ckfinder/userfiles/files/46914238307.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b0bd5660---tupomazejup.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wujuv.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/gosudojoderozajas.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/riduwi.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/41806844556.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/64cc4bdd78a5b9acf7a69ca525f432e0/genewamafogevabedopax.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/43588563283.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109050555595151.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330fd7115b0---79364004773.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/19565551930.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/99476376417.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/82844664378.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/oadfrbf99i7fali1l4jjnvslj7/40554480657.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/tojebulafejepoxelo.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/modegiwulokuxisifut.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/pixovokajalatebaselu.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/kigapelebudiju.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/5362835263.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_6C98065D7E2E4300.pdfIn PDF document text
    • http://stonebreaker.at/10166495630.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14648690396.pdfIn PDF document text
    • http://sro52.ru/uploads/files/daxib.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/tojisujes.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/vogazuv.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_off0000c2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 15832 bytes
SHA-256: 9b3482e9461ba61d38ed50a1681d07295d67e67659a3b506e58da133c8d3615c
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10888 bytes
SHA-256: b2f165c68fb1d6f02853e7f9fcae6c47155e421c4549c122577aa61899a5bbc8