Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1d519a2b757aff…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 01:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bd179c7cf095b124c8bc3a9868448e4e SHA-1: a688bd11b55b1b55fdef2b9fd2c8932cec63874d SHA-256: 7d1d519a2b757affb3e39a1e48ed9fdab89dbc72dfa364c645bb695c6122e149
126 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and heuristic firings indicate a phishing or malware distribution intent. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2214

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://mkart.it/uploads/file/tisukibesonutifepa.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00b997432---neterena.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47323851841.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/35516837183.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/dibefalejopixusip.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/rejimilamo.pdfIn PDF document text
    • http://dsfly.com/uploads/files/losekadideliv.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qsdcmom8urqv6697susftjq4in/75272301235.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c2edcdbceebf22e5e5c5c90184f910cb/21058306403.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/12789196042.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/64665061721.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/sedizubakonufediz.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/84157195984.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/5971198857.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/jivimukapotuteten.pdfIn PDF document text
    • http://446888.top/userfiles/file/26075444264.pdfIn PDF document text
    • https://jensbrode.de/files/file/15779102704.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/pivosamulejexixedobude.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17d8897af42dca53ce9e08426e2fbbe/73007047831.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/kubemibisoririredaxoke.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/73159372094.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/aecbe605a645f313c054cc85b943f2d4/73143162055.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/muguluje.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/xafedijevosupo.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/divijisamumojesirizikor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bike+mayhem+mountain+racing+free+downloadPDF 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_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 16432 bytes
SHA-256: c346d19e201e9defe6c29fa73348cec3298c88a1b4abba6061a96d632c1e03c6
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 11200 bytes
SHA-256: 819bdcb6b6343dc72d4a4251c589a4f704e9879dfa16e704499402f301305145