Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d679c0c9f54b80d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 11:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03f89ef66a4f47bc7abca82b3f47d75f SHA-1: 961e27afbe385e808900790ef1e94b48adc3bb3a SHA-256: 8d679c0c9f54b80d3a17e442b10cd48a2c82ed3786be82222838f9ee58d891d9
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised websites, many of which host further PDF files. The primary purpose appears to be directing users to malicious content hosted on these sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d54ac625---82586668782.pdf In PDF document text
    • http://joltiy.ru/uploads/files/mivedi.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/verugudototironedujotub.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/36443b0ff5388a75081e11fcdc53f2c5/16410788292.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/79041186027.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b2879683---wudusowaxikinezog.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606372b09---novaronip.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijukozinawoxojadi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160896d3fe4acb---teludepevofopajozokijib.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/15612153802.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zidijogekogexa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mnrj7jt3bi4qttgjugiqqc0mks/17474572370.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/13776364605.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/99122783204.pdfIn PDF document text
    • http://abnicum.com/files/file/xizejojowaxuguluw.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b98d127ba092b21ac9963c32e47c0340/72143061612.pdfIn PDF document text
    • https://bio86.net/fichiers/samazabosuxetuzu.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/68580129517.pdfIn PDF document text
    • http://intergeored.com/upload/File/dofukonidurazataziji.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/45656479588.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33d676a6c---xixuwiji.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/sudategasibezukogok.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16303fa03---nirumegapevo.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r2lih57gnsd90keinnb628bib2/jokipujirizusexaj.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/rigikafapikozafew.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/komubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hp+envy+4500+owners+manualPDF 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_off0000c1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FA 10912 bytes
SHA-256: 2dbc913f04661a092d9838c26b2566d86512595a4a3c1337016a2211c89cb63a
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16944 bytes
SHA-256: c6883cd3300be5184557a361b55af5b8358a7738b4c82589a55c7e5c5c683122
font_02_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1