Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b30561ad622dc9…

MALICIOUS

PDF

99.0 KB Created: 2021-09-15 18:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbb9967d89b00262d8f387b51907dd91 SHA-1: 548287ccc9ee1c6f75a4c5026bf7d06aa64cca44 SHA-256: 61b30561ad622dc9cde1c5d36c2c6d0cd4ece13b5665097f53657d2e63e0abc5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing by redirecting users through a chain of links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://argumentua.com/i/file/bepuredewatej.pdf In PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/jewaxogugodufisoze.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/budadopufapolijakumijowo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/wupukojinujeremopaka.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340b1a17d9---zejojomiwevolefefiguwote.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/40285079310.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/werugopusewow.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161348ec7c9368---46749503822.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/tevilubutebo.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/venawosexumujotekirosikir.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/samofumupegirugimowufexew.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/kanalabiviluterikiradol.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/gipegugutapulizitetadej.pdfIn PDF document text
    • http://3sdent.com/upload/files/duwimulorukojiviwejola.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/puvatemibolena.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/xafejesitemovapozaxem.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/75813960727.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sukolabimuxusodenef.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/nobowopopepiwidizafafet.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfeed261f---juvovorewajalaterada.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/junuwus.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/25619400809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=automapa+android+brak+sygna%C5%82u+gpsPDF 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_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 11052 bytes
SHA-256: 259656924457f8e10864a903cf54c8f438616150899eee47a0c3b47aa0ab5bdf
font_01_sfnt_off00012d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D82 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_02_sfnt_off00013576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D88 18348 bytes
SHA-256: 9b8d7b46cce60cffc694740a45bb637429fba1b38f0e06588e9cd034b245c56a

Open this report in the interactive analyzer, or submit your own file for analysis.