Malicious PDF — malware analysis report

Static analysis result for SHA-256 648dfe7f7bec9a3b…

MALICIOUS

PDF

109.7 KB Created: 2021-07-27 03:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3410c7945003def924d387da5bd424e3 SHA-1: 012327cca6046793cf4ed196962ce756d8200dc5 SHA-256: 648dfe7f7bec9a3bc715f8676d3c04068a72fd0b115586d75b71fc87e77f48ba
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://planet-for-events.de/userfiles/file/80963022470.pdf In PDF document text
    • http://dakmet.pl/upload/47750156482.pdfIn PDF document text
    • https://semut73.com/contents//files/wegakonijoxisob.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b0a7a8796---51169909828.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/69382141966.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/95e6104ka3ep36htet1lvkdpf2/61668641933.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/70961500214.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/91893731416.pdfIn PDF document text
    • https://numberonerevolution.it/file/samexuvepezu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c424d91aa93---34458552620.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160874de2a297f---rakajujivuzokipofezelefof.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/10993991654.pdfIn PDF document text
    • http://azizolace.cz/images/file/30831286336.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/27520290250.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/77607752690.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jasuxudogodawatudezapi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d432514035e9df372c09994fa6ccb3d/44102452234.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e64680d71b2---5708018100.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s0rs0ce314mfs0hv46c7s6tuvu/96251899917.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a9944593---5533004024.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/bivepugeg.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210619224332.pdfIn PDF document text
    • http://yuha.be/_files/file/pevaweguro.pdfIn PDF document text
    • https://abeess.com/userfiles/file/xikezokipalap.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6be73106e---gugobevikuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+does+air+resistance+affect+a+projectilePDF 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_off00014718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2A 17860 bytes
SHA-256: dcd330158671bf5fc2d24cda98ddc45000367a1e7b53e0a38c8f50830f7d610c
font_02_sfnt_off00018e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E94 10820 bytes
SHA-256: 5efb65f65e9994343ac9973bbdd8c108fd7b1eeed44cc474e1fbfcaf1dffee92