Malicious PDF — malware analysis report

Static analysis result for SHA-256 f675a0bb8e3dcf0b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 19:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4ff6b6c2dde5ec540906d6cdec6f007 SHA-1: 7ab0f4b49aa89d9ebbe17e696bc77e58df9c2d05 SHA-256: f675a0bb8e3dcf0b66abfcb9aa2464295e892e6f2061cc10ba6422d6e9ed29e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://guineaservicesproviders.com/gsp/files/524565577.pdf
    • https://andana.us/files/files/96888041662.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb534ce5f---43021155890.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f59bd4f2f317b932518b71a2e596fc34/38570736546.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1309882d2---mesipugakex.pdf
    • http://allprintusa.com/admin/images/file/57924334076.pdf
    • http://idealhca.com/admin/images/file/bedoxunidavilusepavav.pdf
    • http://it-hair.com/userfiles/janekivagid.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3s0h8vni1v9u2kmrst4gqd948o/10061757746.pdf
    • http://parcroyale.hk/userfiles/78616678896.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d3g4prn7j198lu1p9rj2jba223/rufisewigomarugukomedimat.pdf
    • http://partnerplus30.ru/images/fornews/files/62418520698.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c2ac628ddd27e487ac33dfac39d887d7/sewuzepojagexeka.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/q6v0uuig8ssjs3jqj90kncq637/fenipot.pdf
    • http://tuzvedo.hu/elemek/file/59314159388.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ae98616a64dfffa58960a8fa8036e4f0/jolexiresigidavizila.pdf
    • http://work4shop.cz/userfiles/file/dumawedediniwekisu.pdf
    • http://antae.be/app/webroot/uploads/file/10521396402.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mt09dgl0fe3v2lhjakdvp2htg3/kenozejidupijezob.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cddad1a6---kupamoxofiwotaguni.pdf
    • http://www.deco-interieure.com/userfiles/file/tikamatoduwa.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/daa571ec5b9ba79fbb30358ebb434652/bikebuzowatejovigi.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/wuromixilaperaluxuza.pdf
    • https://webmenuplus.com/images/file/31287828537.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=30+day+weight+loss+diet+plan+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_off0000c30d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 16792 bytes
font_01_sfnt_off0000db1f.bin
51baf2fd568c27d042d4dd28e231274a31331244fa29147a9de35877afc014e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 17532 bytes
font_02_sfnt_off000107df.bin
6a612285fd1c4c1cbe6eb76d80d239631449f7aa89f6a118d9551d1f0e18fd51
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 11072 bytes