Malicious PDF — malware analysis report

Static analysis result for SHA-256 75083e8321a6fb02…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 23:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a99cb2db96a7ab4d1b94a9257a55149 SHA-1: ef60ab5da3d0f326df527294bd6a9cf81dc95279 SHA-256: 75083e8321a6fb02d1f4abec60ee3b68bf66d75f9c704e045202ee06eb224bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute or host malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d75b0eb85---94381261254.pdf In PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b33b4bbad---mogawewarunisurezozupudi.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/kufavitoxadameketut.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d21228be---31226837131.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e682155ac1---7360388200.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/78545368987.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/dareluwewel.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/26114824111.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/walijajuxetaf.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/fowavodobigafokavapeba.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/zadosoxesumiminefitululad.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ji9orkrda0jf40j3u5chanuct0/57012143072.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/pexepenuromisalerazuma.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117dc7269643---movalojadurife.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/vimimizewifozegakipal.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed72e2b443---rixof.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/17382929549.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff02e7a146b---mozavafu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa67a87622---90896948065.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lajol.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e5a448c9---jovodimobemoramezekuvoxu.pdfIn PDF document text
    • http://langmypham.com/luutru/files/38037621916.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd81c1c961---16953669224.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/82497885884.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887914c453b---50720522863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=john+deere+stx38+manual+free+downloadPDF 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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 17768 bytes
SHA-256: 9a1ed4e125982821b66e613e817d28d9b07dcf8d5bf97b86febd97de0a5b52d3
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 11188 bytes
SHA-256: b5c3e8bb2060445ff7b8af5c3b15c786a37780fad889881cc5668a5711fe6d46

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