Malicious PDF — malware analysis report

Static analysis result for SHA-256 54611f25745d2b02…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 18:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b721ce45843137bed07eb06fe6dea8ad SHA-1: 0da9971fc0c8ee07091f4177ba0f202586b7255b SHA-256: 54611f25745d2b024ce53e8632dde96db9c7e785f4e5c9c4ff2cab8cd6ce86fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://blogsma.com/files/budajinuguropupijos.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/jalivovul.pdf
    • http://brukikostka.pl/uploads/page/file/lalozixexojetuganiko.pdf
    • http://ykzn8.com/upfiles/editor/files/90148827305.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/37525151191.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/pawebesijiwefifa.pdf
    • http://quangcaosms.org/media/ftp/file/33986385107.pdf
    • http://forglass.sk/userfiles/file/74730827630.pdf
    • http://oasis-inwaste.asia/files/file/mamedujav.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d0ddfbfe1588fcda7684dda150ffd22/27503704711.pdf
    • http://czernavendeghaz.hu/admin1/file/menesurapokazimirumukedo.pdf
    • http://okudshava.ru/userfiles/file/89761745576.pdf
    • http://carszana.com/image/upload/File/wurewezizimekibizowigo.pdf
    • https://hamasataccessories.com/userfiles/files/82127637542.pdf
    • https://keluargamimpi.com/contents/files/54158445009.pdf
    • https://coil.hk/upload/files/73556396970.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/gosagufoxedurutopu.pdf
    • https://bestofbucerias.com/upload/file/siton.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/49143973144.pdf
    • http://sahrugs.com/userfiles/file/33936863954.pdf
    • http://atel-j.nl/uploads/files/66329650116.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368bb5b6841---gixakaweg.pdf
    • http://takramaipai.com/mypicture/file/59224228681.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ace444d51---muwumedaridiruzemosu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+handmaid+tale+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_off0000e262.bin
f449a24473c9b167c697832009e64a965a08bedbbe82f71c2ffffc1cd41c1d5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 17776 bytes
font_01_sfnt_off00010f7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
font_02_sfnt_off00012796.bin
fefc10365237fc2aaeb6ad5ab6ab535fdaf20d25949557a01545045e571943d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10340 bytes

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