Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5ecc9b6110c2af…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 11:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8eba51cd17bd1fe8c906f0135284c6b SHA-1: e0043fbfa2baf7f5f72f34fa0d553d2011ff94b8 SHA-256: af5ecc9b6110c2af57f7984c885851042f0a9cd87e5f1377597de45868562dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=mario+64+nintendo+ds+rom PDF link annotation
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bepetilitenuxo.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/79995476401.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/39437676933.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/jaruzetexikoximijofipefe.pdfIn PDF document text
    • http://eternaseguros.net/files/files/lofiketopesajakire.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/26188773056.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/45996904854.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a2a3fa01851f3b5acd074a7fae3a10fc/tovewoxagil.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/73928604541.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/88200526619.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16538cfc4---47742913279.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/zizidugelekuv.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e94091770---tikalodamonef.pdfIn PDF document text
    • http://qdjshg.com/files/file/ridogogapawojimubud.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/14391341046131f95e7c369.pdfIn PDF document text
    • http://arablift.net/userfiles/file/malitamiminumenizoluwiv.pdfIn PDF document text
    • http://saaretravel.ee/images/file/17569217885.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/64037460614.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/66d11b7c393f81c1e3ba89e8bd58e0e9/gikuzepuvakewijusoligiv.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1928711d---51945738457.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/46471340047.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/63136787963.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tadaxur.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_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 17540 bytes
SHA-256: 137d2535a387532447b8b71822778c87c6a72c15c54322f3dc13b620dbcc6d6a
font_02_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 10600 bytes
SHA-256: 15f48faf0c3508e9b8fee14c1d4a8a7b15ecef01f4f358658977f55babdc0f29

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