Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa7df07c9454cfc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 18:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9762d06108a3835a94c7bd989bedd31 SHA-1: 8283abe667b1cbdf73b902de8b23e22d747fb287 SHA-256: ffa7df07c9454cfc8503f4a965a3396b159dd7f4b968e285d3e763df4adc5a87
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=skills+for+the+toefl+ibt+test+reading+and+writing+pdf PDF link annotation
    • http://chugguwang.com/files/fckeditor/file/sibew.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/pumetipafewemaroxiwogev.pdfIn PDF document text
    • http://trovas.com/userimages/97540534199.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/fuwinotagafapatodesi.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/jovigeruvosiwokuzaz.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vopalijonewubumugezag.pdfIn PDF document text
    • http://lejuriste.ru/files/file/xuvutimefagujowaro.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/34827106405.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/32747728244.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_E4CD730BAA9FA82A.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tokuwedepileb.pdfIn PDF document text
    • http://zuche0551.com/upload/file/31446540500.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/33527127082.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/memapovigoperi.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/virewopetojutezarose.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/tidebopajiredej.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/xemazururabagup.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/fozuduwisizaxazu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/fugoxujagatene.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c6c7e4ed---rujetogikosawitixilelone.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xupujetidivimotuni.pdfIn PDF document text
    • http://screen.by/images/file/wezag.pdfIn PDF document text
    • https://sambelteri.com/contents/files/48221705718.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/merevivexinogisino.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/50759931031.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6585c2d1---dodoxezesat.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dedetujifixoxepob.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 19952 bytes
SHA-256: 0f1a6ce97923728a12df492422855c362be9811152c17c26914b41e635588f2c
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 11172 bytes
SHA-256: 0cf65dca3a640c24b4ce01fe37dfcd2b5bcb8b33ea3c34d2197eb8016921c1cf

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