Malicious PDF — malware analysis report

Static analysis result for SHA-256 537112e08d92c2e7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 01:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 032f4f65863dd73e84246bb13fd663cc SHA-1: ccea24cc4c0c8b6ba644e0aa8b24df2f4b045df9 SHA-256: 537112e08d92c2e7b0b08d8c0c582ce425c2d50f90ea5eccf18d660792a1184c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to leverage legitimate-looking infrastructure for malicious distribution. The PDF's primary function appears to be directing users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.1488

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cafepiolho.com/uploads/assets/35696841821.pdf In PDF document text
    • https://csmgh.net/pevron/www/img/file/sogaxija.pdfIn PDF document text
    • http://patroha.hu/file/79260553952.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f10c7e47b---92584982398.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/19230657550.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527cab0f41---paxokadakigugununizom.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/vefexaja.pdfIn PDF document text
    • http://gaudi.tw/upload/files/pabifurikipebexaguzoge.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a41f689e1---tikoketesagovesijodigib.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/18911128359.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/piruziwugenuwus.pdfIn PDF document text
    • http://ore-processing.ru/d/files/6637700616.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bd779d0dddda36a0f3016aca5b8e85cc/16749938436.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9f91dd5e13d83c67f4b6feace7ee208b/61774572252.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd0573316---kizogezesewi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/xukomatudupid.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/wipawipavidusetufa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jefoxawoxexipubu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42db9d82c---gitov.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/24745471646.pdfIn PDF document text
    • https://bawauang.com/contents/files/sefagixeded.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/65164415280.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kuwuluxemawenumexinur.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/39308776858.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/826c0ea1fd74c33d8f072751aab42a02/4931120730.pdfIn PDF document text
    • https://salwangurugram.com/files/pepugogamipiwekufu.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/gemidanelabup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+enlarge+font+on+androidPDF 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 17796 bytes
SHA-256: 2ecbbd246e02e935f9710b10d0c0e4c6cf4c367b5297bb63111d05dc7fd63b6b
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10436 bytes
SHA-256: e1df4b41dd20d495be2d0d9bd74c6199c17ba31f2dbc3b2155e851a9f975876d

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