Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee59d5dd5e9b20e…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 06:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6824d64ea3b08264085b30c8eb01e9d6 SHA-1: 027771a8bde06af07eb88bfeb969c2a40b14ae0f SHA-256: bee59d5dd5e9b20e9c3ca6871dd79d5e85a315c9adec8530f6fd90106a77150b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a brand-impersonation credential phishing lure for Facebook. The PDF contains numerous links, many pointing to compromised WordPress sites, designed to redirect users to malicious domains like coretry.ru, likely for credential harvesting. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://coretry.ru/uplcv?utm_term=english+verb+chart+pdf.
  • 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://coretry.ru/uplcv?utm_term=english+verb+chart+pdf PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e84c8cb7410d548f31e4969d542a9c04/13789726502.pdfIn PDF document text
    • http://szwygs.com/upload/61245889690.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uutb6mhj7cdnlhlii93hs0qd90/nukop.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/87982789167.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/h3bre8bophcb16pevg6hkag98j/kesatimarivelefama.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7579f689---23888776343.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/tupulotezasu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9d419a90---gazakununivewe.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/64005303716.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/fiketotapuruvena.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/bixenusav.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fb400de0---zudilinolado.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/33787277830.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/99531933392.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/50346724764.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/60869012700.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/12902122037.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160926cfd7cb6e---sololanasirigepamuvo.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/nubidiladuxugalavumuw.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/77794668539.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vml18aenujotjbv4titknnb8kt/sumojugomagoxepuxuvovesub.pdfIn PDF document text
    • http://maihome.hu/admin1/file/14038712980.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_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10968 bytes
SHA-256: 17755293e3fcf870c33b6bb1c6acd2f49c8dbf4d35c41324761626437daa61b1
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 17508 bytes
SHA-256: 9813b82a3b2f0345ba96ac838c32a044c0a14e90c5fb6383701b82c525523f83
font_02_sfnt_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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