Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e6315cb6ebc23f…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 02:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8e7cc10b7fd31df1f4008a7add1f079 SHA-1: 89b4e30a3716739af30d64d27028663429fa1962 SHA-256: 42e6315cb6ebc23fca1167b58f4b3656fd34a0112f5f321565c13d2d8e1322db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://accessiblevehicleservices.com/userfiles/file/dopote.pdf In PDF document text
    • http://cokhixnktientien.com/Images_upload/files/44478230004.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a23b1ca901---72141232951.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210702_0D09394A436FDF70.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bb7843e7---86134767670.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tawitajewelonuzugufoj.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/79600377871.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/wopubawigifasimolefe.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/41389335498.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/68950934046.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4a60d9d4---papafovolexezibapadel.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/19711177759.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/zoruruwafimis.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/83d83bae5c3aacbbca1c6ec67796b816/fowojaweluxokusobof.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zusavogazek.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/negibujefowiritogik.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/gesabepigarateresukem.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/fojikelij.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/lewik.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lowavananufa.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d98046802c481af45080d26df3fdfe4e/74718112225.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rurolusu.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/butodekozalajelisositonid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=surface+go+2+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/61659640bff47d9f1da3dde3d5fac2a9/62442803325.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 17468 bytes
SHA-256: 123448d336aaf533f4f97b9425c2242882b8148c065685e7963df56a259a9120
font_01_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 10616 bytes
SHA-256: 4d50347325558ec967cb7bb3aba6b2a33793cf56cdd1fabadb1ca250079ef1c2

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