Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67f1dc2dbd8b1c1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 22:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68897bf0348b6491894d4a2627583360 SHA-1: c10008fb0b8e9e1885d8fd232528ea1c8d700d88 SHA-256: d67f1dc2dbd8b1c13a980323146f4b1b07741535b820f2a3f17e2681f68c38f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=signal+vpn+apk PDF link annotation
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/13546667318.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/kafusumefoxanowurogasaz.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/56407344046.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/72877641334.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/tefakaxezo.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/47221035264.pdfIn PDF document text
    • http://195exim.com/datas/files/mepalaroxe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea404e8ad---25188282957.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2a526a2c---fasuvamaduxilew.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/jigewanukatud.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/ravajanital.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/motawapalubinutoxege.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/golinonowiwimabisavor.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/revulamaxaxubivoxenokuvam.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/mepefoka.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/buzezivakuzavilanoz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/eef5668e98dcf6f4f42e27e982a6dae8/sesopexufupu.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/13441063028.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/telofijeturelisosigoxuroj.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/vudovoriwoxoremimided.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210917193500.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/wimofujona.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902125809.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/96597311048.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ba506a74---10896203479.pdfIn PDF document text
    • http://melabo.com/upload/files/momumekezesawisaganixu.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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 10040 bytes
SHA-256: b6b07bbdd7d62a19ff4a18bd594ad0bccf89f2304a12c3eeac6ffbdd20e9e684
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 19032 bytes
SHA-256: c003ac9e92f5e37d87d6e8d8944df3f78d9a5cef458a756e9e99fd41757ac1cf
font_02_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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