Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb85b1a0e9f58b…

MALICIOUS

PDF

96.9 KB Created: 2021-07-01 10:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4611a4258532277dd77408b8108668d7 SHA-1: 5b0094cabe603a6df767a947cd8d45000b9fd2ce SHA-256: f5bb85b1a0e9f58ba3fff43fdaba2f7a9b2e669841125e19a574d4c5061fa9e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://drafthe.ru/uplcv?utm_term=fall+state+falls+park+tennessee PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4daab0247c---dajinisabobi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/35513883211.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3b21d806---75941485869.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/694f4e6eeefc2b60e9da8919c3fe4090/99718822188.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6a7bf70327441f4bacc9dcdb1ffbba34/8263251031.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/misopa.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/62188867574.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2a8f22af---19325250834.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ebd5bc38787791d12ed086f6b5c614e9/vaduzeviwepumewe.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5ehmi66l4941dm51poheboaitr/38405418742.pdfIn PDF document text
    • https://bio86.net/fichiers/17846937553.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/29833369260.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0195626134cad4b8b8cd96fb3f08d8ad/19665292744.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcf8a77a5---31238612314.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9aefd6f77---13511311932.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf9c5ef4f---61927585564.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607992bdad118---jofum.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdfc8bd98---52571830019.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3816b48e3bfb6024544dce3ee2a90162/kusegoxu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664657874---25218939729.pdfIn PDF document text
    • http://carszana.com/image/upload/File/33791684019.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73c704c28---tukitafodezok.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/togetopimunujijezediziri.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 17764 bytes
SHA-256: a69ce7035f117bd3fd95624344d476b7b84d9be7798307691f6cce3142fcfe3c
font_02_sfnt_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D72 10208 bytes
SHA-256: 67f8b739b3504b8843715a5bb93a03c558ae6499bb4c479b41365a3980be4613

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