Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8b9bdff8f7324e…

MALICIOUS

PDF

77.0 KB Created: 2021-08-12 21:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3fef5b496925dd3a1f5929f5de1dd29b SHA-1: 4882d86e9d1da6d5d67444225bad1bd4f7733014 SHA-256: 9f8b9bdff8f7324e4e922806528fb1c50a60ae37adb6d9323306fa4b414dd6f0
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to external resources, some hosted on compromised WordPress sites. The presence of a 'download' button lure further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.geo-decouverte.com/ck/ckfinder/userfiles/files/tolatijekowurifebose.pdf In PDF document text
    • http://chonburi33.com/userfiles/file/99506940674.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/vixozodazazuzi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7baa56d2---jusukupedetomofuvevafodi.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/28297775750.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/burakopebatip.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/goree7hctq70vc6fu3r3eo43tv/fisewezepuvofosib.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/66494705026.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/916utj52q2p6ihhim3qnub3sg1/20783217200.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/tevemosulo.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/legadid.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/81291616142.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/94896507047.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/18371088650.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/zugudineriw.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/7436952176.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vumiboveduxa.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac5cd001b01187dea4b5b938b90b27be/39804467653.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197999b918---wumasumotusorabetezega.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/43456343ab7828c513ffd434448056e3/52131815379.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/85928472341.pdfIn PDF document text
    • http://ned.ru/uploads/files/72887909094.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/mafalexomeduverenunixi.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/wokirufulepixeguwamajive.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/48777846424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+download+english+grammar+book+in+bengali+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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 11144 bytes
SHA-256: 01b112856377b8d1845d31fd6ae2627bc3376b1916545977df2b1abdabdc609d
font_01_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16696 bytes
SHA-256: 6685c07ccd09900920cbe9ae58571d4134071ebf5480858a2d986916837c0c6b
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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