Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce82af76ae2a724…

MALICIOUS

PDF

82.1 KB Created: 2021-07-04 22:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 740bb2f4c88ae5ac48874c7acce32e81 SHA-1: 2b71a42c532041b0035aa818ce57ff1fa81c84a5 SHA-256: 9ce82af76ae2a724ac78938c9e536919b77347bcc02e10b8fcd0dd4cab84b3d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/aba988bcef0018b00640f0972bb89754/xojijufoxikasarulosugilog.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4f7229dd20957664ed6dbab601eed581/42955677344.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bifofutetutogud.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c26033c9634---86332741738.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kilufifub.pdfIn PDF document text
    • https://alutat.com/data/file/81288088524.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/55826514349.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/zoketuroxosefazen.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2e8a0c8ca99711fb6e02665993b379be/98287723218.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ca8f07acdae29a6a89e4d91bf29f4e83/30580009414.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/kesofuzosumonewi.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lelilib.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/62421887084.pdfIn PDF document text
    • http://abnicum.com/files/file/38477040784.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/55995754507.pdfIn PDF document text
    • http://ahchala.com/img/file/jegozupoxoxis.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/74448126102.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f939697c80---muzubasoroxa.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/07cb8e608e544dcd6d79e2410798128d/49836256816.pdfIn PDF document text
    • http://nfc.soo.jp/file/dujugivoguruto.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/mekigolopi.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/rogova.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1755aa8a2a---31886634175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=back+channel+diplomacyPDF 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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16580 bytes
SHA-256: 70c6d74edeeea95aa11ed524f8c2887fb61982eab0a41551e1b1827465789a7d
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 10672 bytes
SHA-256: b7b0f7fc59fe6f65cf531898daeaf7827840713f1d833f25db49fbde71532f3d
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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