Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbbdec8ecf88bbf…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 05:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4d1a0bc4f0c1a8aeeab2dc558a9e8f9 SHA-1: 5b7e02bfd7c4a448eaea266416591614fceb5c43 SHA-256: bcbbdec8ecf88bbf4ebe27197460487cadb0a793dcca1953cc5541c99a78a390
144 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to external PDF files, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the nature of the links and the ClamAV signature suggest exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3477

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://naves.cz/res/file/zurela.pdf In PDF document text
    • http://centronegozi.com/public/98718750133.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/70604594102.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/33373183018.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/48230768555.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/93100937806.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/woduloxagenotu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/23733669437.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d626da5f13---punuwujeb.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210914183136_eg1fby.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/kaxapabawozodexo.pdfPDF link annotation
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/sewudavumegulewulameledo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac9ae6aa7---daseretiviposuremawov.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/18455496321.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/detaraduvo.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/19877940092.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/96944680587.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6857613e13ceaaa21e6fbe60293ebc7d/35947694243.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/42884256579.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a079e67eda---pezekofetudagasu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/73616691593.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/7843959334.pdfIn PDF document text
    • http://zerosquareonline.com/file/83986257956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hockney+joiner+photosPDF link annotation
    • 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_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 18020 bytes
SHA-256: bf3ecad3152c49a977634db5f493adc0e4c92d4c6a032c5e63917df8305c9a15
font_01_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E0 10592 bytes
SHA-256: 9e97a436fa90acc5b4ce70f07c107eddbada60f7eab165fdf7cd469f24b3c38b