Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f7b14d7163a6fd…

MALICIOUS

PDF

101.9 KB Created: 2021-07-07 11:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14e1aee13584c9af2524fd7838b800d2 SHA-1: d03b0eec1960314b0bb1bdee192568661982f532 SHA-256: 62f7b14d7163a6fd025773261125ccbf0d8b26b4b15a2d62838ba571f1137015
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.moyekolodin.com/files/rivat.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/loxoxoli.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/64641464579.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dinon.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/17671438070.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/95724727127.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe649e271---toxupubixaramirusezale.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/48570900002.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3aa181e245c939cffb71082636e2cd48/warakilofifipoxu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fcea83ce---pabek.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/upae404993fhec3v9f763il2qk/22130176159.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/50598202294.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf34dc938---vunidimuwelesazilosexij.pdfIn PDF document text
    • https://landbar.com/upload/files/31743743259.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd8154f2a---mejibumodalifovuna.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/mesemamixixarenirig.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bfa5cacb84e8faae58839557020a2166/54734870974.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210517163822.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cea31e2b04e7aa96f418d32cb89b8e4b/fuxitikutezenizodubarikap.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf16ffa3936---vuledisegot.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/vepadugotemurajojajemufos.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/78348666151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=carpentry+and+building+construction+free+pdfPDF 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_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 11180 bytes
SHA-256: b4f79530fca46ddbb6b0319bf81175fe3478876927388e902e7424b4646e0274
font_01_sfnt_off00014391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14391 18040 bytes
SHA-256: 05d17e1db8fd765419b676f8d33083609df016b68c1d6b874af5b37aa7e7bba2
font_02_sfnt_off00017223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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