Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab68631c7183f3c…

MALICIOUS

PDF

76.6 KB Created: 2021-07-06 16:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: aeda3945293ef3e0830966746a4545f0 SHA-1: 4b600a749c8680eb17d116dd38d19d1e63044287 SHA-256: fab68631c7183f3cc4d2b4fd8ee29633364aae494750a3bcc26f3b6683ba9f4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and a large number of external URIs. Several heuristics indicate that these URIs are part of a link farm hosted on compromised WordPress sites, likely designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kajsanordstrom.com/userfiles/files/ruxalagazobelozusiwi.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/08056c8a44efb17069ad8ff3eabdfb6a/59165136839.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c6bc4a6627f679eb8fe88e535758a43e/zafinuvesapekite.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6883e1a1---fokajaf.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/44552669481.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/dunejuzifisaz.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210616112329_vjrmpf.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a935e867735---1037930398.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b67020a39---puxoxakegagalivoborotab.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ab9422b3---joxafezonekunewegulamif.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3ca5fa8b---87254068795.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c5b4c1026d2f0576575865a2658aa63a/81875526064.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efb14394874090c952c0fa016f34f519/59201507688.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/59161806264.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/45891683478.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/junefozajuxisejeve.pdfIn PDF document text
    • http://qca.ch/userfiles/file/zivape.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b138af2f5---wowetejolina.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bedib.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/54019356735.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/kagiboroviwizeresaze.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/34156539214.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zojujodotorefadoki.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/da3968c4c78fbd258ef4b11c467bc064/58741182899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=exercise+1+body+organization+and+terminology+answersPDF 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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 11252 bytes
SHA-256: bf3f8b50bd346558bd2333cfbe396c411f8ea6e814a3625cf8530d99b894fe3f
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 16112 bytes
SHA-256: e31f0935b9bf685292dc5ed4ee53a0588a064e5262584e6f2a53ef8d695a475b

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