Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe990e02c8ee2717…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 07:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 668e6d603aca26c52f1fe7b0b8ce9c5e SHA-1: dee6ad083985e104ffb24b3082b140fc544e4b00 SHA-256: fe990e02c8ee2717fcc565bf9bde0895bfe080b0af3ed656696fb61e40da6864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious further supports its harmful nature. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=thoptv+app+old+version+download
    • https://moiatakashta.com/userfiles/file/xakijirumo.pdf
    • http://studioesflores.pl/obrazy/file/27852396012.pdf
    • http://risme.vn/files/defabixutedomolipig.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ed58decd96ab3b2f0997ff9ce54e854/76417086172.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5951aad09a0dc0669265bc803333d76/58550551165.pdf
    • http://slovoveri.org/userfiles/befabajerasoso.pdf
    • http://eternoohydro.com/d/files/65877825928.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/biruxivifixu.pdf
    • https://alnahamgroup.com/userfiles/file/79973937647.pdf
    • http://jmk.kr/ckfinder/userfiles/files/51070200247.pdf
    • https://sfeerweter.nl/userfiles/files/53988571774.pdf
    • http://agro-vostok.ru/userfiles/file/mujuxixivonizebiza.pdf
    • https://parvazyab.com/basefile/api203/files/2513275601.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/58186412300.pdf
    • http://jmyhship.com/uploadfile/files/62522483997.pdf
    • http://apicn.net/upload/files/24897811448.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138620b5a78d---potusilurupopubefizak.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/60320587907.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/62931183990.pdf
    • http://rosg.net/sa_upload/userfiles/file/20210916103653.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/99169018670.pdf
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/befaluga.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/18171758741.pdf
    • https://yellowstonewildlife.com/wexosir.pdf
    • http://greenmodels.ru/uploads/files/40774884501.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b4bb10572d7eaab2054e59e8f6a7a760/madutivufuzowenik.pdf
    • 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_off0000e6c2.bin
06d2930b290c69f5c903e2d4909e27d092b530e998f6d1a1eaac9c5dafafc906
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 10604 bytes
font_01_sfnt_off0000fefe.bin
58381c6a8887391e062b8ed8e7eb4a4150a421f8af9cf501d421815eae2e6aec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 18708 bytes
font_02_sfnt_off00012f4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes