Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8744b9cae7a3cc2…

MALICIOUS

PDF

83.1 KB Created: 2021-10-07 19:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf91df81f79747787210226fc9e5f8fc SHA-1: 81aec7b9e156458e1ad528c7f2c4dcc7ff491034 SHA-256: f8744b9cae7a3cc2c33fc5716056efda8ec8a46801525a0195a69b02b1a32ee0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://huntic.ru/uplcv?utm_term=poisonous+spiders+in+pa PDF link annotation
    • http://ukonlinedirect.com/userfiles/files/gopetanosefopiban.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/28768266286.pdfIn PDF document text
    • http://aquatherm-graz.at/files/67260544515.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151fc35ddd32---mejoruvivixogibeb.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/lasivefirezabine.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/82670300066.pdfIn PDF document text
    • http://kisito.com/userfiles/file/buzedag.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/19387750223.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/37855139674.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0f397b08a79a4c9e4b0f72c33575ecb5/69452893787.pdfIn PDF document text
    • http://scsychem.com/upload/files/41892694808.pdfIn PDF document text
    • https://spyboarcams.com/files/ruxatulapigumusutisiwuk.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/61577193137.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zotoj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614250425ae4b---xebul.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/mopib.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/94188821450.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/eff46b05a5d9d94a7d3893e365fd2325/82302759060.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/kilakobufowufitufidijiv.pdfIn PDF document text
    • http://cresapumc.org/files/file/67518714609.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/gimikatu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/19300236271.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/6467821866.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/228971e98cdf27f066e1c283c4177d04/2473309769.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/mimejeweruza.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/ximaranap.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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10340 bytes
SHA-256: 55de1f18299552bcacd416eb7fb41c9df7b58061a292d7500592add5a419a11e
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 19508 bytes
SHA-256: c35cf562c9db39b6588755596dfd7f1332e90759a918c2051112d7f89f808e7f
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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