Malicious PDF — malware analysis report

Static analysis result for SHA-256 70992aa000e1648c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-08 11:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60a5a46c753c2f400ce204abf3aa1f8c SHA-1: 866464fc2536fcebdb8cead4f900b286607a7e4e SHA-256: 70992aa000e1648c8351e980dc1c278abd2f24eb8ce7ff6075dcb07bcbf75f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the heuristics and URLs.

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 https://snapstudios.ca/userfiles/file/tamugodaxoxusenoweg.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609accb5622f2---soxipo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4tk4sa7c8p1mu7f0hp7q62rpmu/57837526311.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/vamadefokevubugosusabo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7v4aua68f8mnanl7laaibd24o1/85834954946.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/4119840425.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7f4c9911---zonupafe.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/2153844085.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/ralapawapanalarakizitu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641ff810d7---45569683730.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/56425906596.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/88492202527.pdfIn PDF document text
    • https://senfina.top/uploads/files/53553350442.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8933a9ec---zeliledurupubifekogeve.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kajosisuderatoduxolejukur.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ec15ddf3adf3bfbf1749569fcd7ff04e/wetawaxozimiwusivudu.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/63727709193.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2354bb92---dedijapuxonix.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b01ddf4ff1d706d71cb9ba1175fb2926/ruxelowunalometugutaxabo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626031604382320.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/10159437258.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/78682903806.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/82e905664ae80d846a9126ff206e10cb/poponafoxekil.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/7289841746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+gearbox+rebuildPDF 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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 10492 bytes
SHA-256: 17254792e6f7f23f67a3549eaa28d71eb198b83142038b3a025039bf7d3b9279
font_01_sfnt_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 14348 bytes
SHA-256: 891045a6c606ba33a37436a6a3e3057ff63510b6ac7b23a0f23324d4f94b38c7
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1