Malicious PDF — malware analysis report

Static analysis result for SHA-256 f745c22e99ce754b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 20:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc015cf0a4ea429db210b080ba6feffc SHA-1: 88afa664bff0f665f9c0a82e143fc2ede37ba9bd SHA-256: f745c22e99ce754b04a4190aee84b818ca55cf16689b6b18499d2e164e78a919
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 5

  • 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
  • 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://okna-kurska.ru/page_edit/_samples/userfiles/files/fomajuwiwalipozekez.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d72c96223b42cec3067977d0db455626/nibawekituvakuvozeso.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/benuguxewitaxapikeno.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160948b16343c7---vumovawidunejojipepu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081921ea7d11---61831992923.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/17313291216.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609380be1db98---wajiwiwegamojoxavak.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be62977ee2---34252321484.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rodimekilen.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9f9a864a---gexowilegireniwerem.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/19837263706.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/61705187755.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zuvemub.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/75696493083.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/11324669782.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7a17ai063crp420hs33gptg451/49230971539.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/62510939503.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed2732fad---detaladekopu.pdfIn PDF document text
    • https://aneri12.eu/res/file/50939820436.pdfIn PDF document text
    • http://goldmustang.com/files/files/7718192844.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5bba13341---supibafuvalebizazebawini.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dto12nkoe6hhck9jeqib8q6ugd/43772385079.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/70561476339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+book+of+magic+squares+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 17596 bytes
SHA-256: 3bf5f5ec84019cec7640eb8e0c1793476d843b7849f2867c092adc18817d173e
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 11260 bytes
SHA-256: 23bf136adce4a1a3aa3fae8d110f266417a473b6a32b194050bd7c6d0906fd6b

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