Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4f16fa4f6ee4e2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 09:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc27b6572dfd7f99bf4c400245a3bfe0 SHA-1: 689985b89bedd96214bbfcfbd20445e91dfa4089 SHA-256: 0d4f16fa4f6ee4e292cf29b1770325bb6d80a0ec4f4b0635d319cf171b1d24a1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, such as 'huntic.ru' and 'reszke.pl'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=bypass+android+6+apk PDF link annotation
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/wozamepeniveromofexujibej.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/78932059221.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/dowedamabolevaluwas.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/9299067976.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tiligebenazaxepufifij.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/bakotugigovetaxuzilafeg.pdfIn PDF document text
    • http://skupka23.ru/upload/m/90026450620.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/bawikufumido.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414ceb48ce3---43006128421.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/tezane.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47b5cc986894712122c073f185ced7b4/labarobakedemijajuse.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109152133309850.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/39297333670.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/8801934081.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/75654684067.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/195130673.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xuzokopipovumewoxipusa.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/rexilidivijagujig.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zesefawixakigekivi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/55031525564.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3c697e59ccb6fe0dc60ec51066c9a9a8/23088779576.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/vatarugesadidumes.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/83121213320.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/95596518380.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/livaxibatin.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 18836 bytes
SHA-256: 45f295d855a7dbe3d8b8c2c618a6cecf511af3d7f570d59cafb12e44f80c5e79
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10536 bytes
SHA-256: f584721cef4dc381e5b6f4ea64aabff31c83b94dab98cb2f0d8c6fd7aa119c1b
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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