Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40745d211e8e353…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 11:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3e525381e019d66615739c387edb6ee SHA-1: 295b2853fc405b9ee33c38c0fbb58cce39b8bad2 SHA-256: c40745d211e8e3533fa29e2a0a0541cf2b80f0cfb6255ca7bf35ab015aa6b8d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.abandassociates.com/ckfinder/userfiles/files/74615047450.pdf In PDF document text
    • https://hahapediatric.com/uploads/files/202109080533078986.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/gadakazematixixokarezebaj.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/86069024752.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7ac9a6310---13650833436.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/25877693682.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/440cefbbdccbe5820fe8b25d4eb40749/dizejafen.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4388984b---vorezegimaleviwukudotivi.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/77608895426.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/xesojuridivejulev.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/54582112200.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/35565642445.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac038bd03---64721837290.pdfIn PDF document text
    • https://www.confirmedtour.com/files/madaxefotabopovujasa.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/zoguwibo.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/zigutufanula.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/widozewusexoli.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xesulomafudafusizuweno.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/futizadufoxi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/xewoxifadapoxabesapeforiv.pdfIn PDF document text
    • http://chenruichem.com/upload/files/28840863230.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/nupoxolinujabikeso.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sunobunuvokaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=love+yoou+soniyePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB1 9932 bytes
SHA-256: 328dc491526906df745643cbaab7ac10c5f9e413201f009ce87025531e0a3a0a
font_01_sfnt_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 15156 bytes
SHA-256: 63e227c15382d44d721f251201282572aa50543a6f67d9d596cc2e7de3837348
font_02_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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