Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa6d32b647451cd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 04:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bda5c664cc0bea1339254280d3dcb9f9 SHA-1: f18edfe464a55e31f0320fbe749cb1e0c125edd8 SHA-256: 8fa6d32b647451cdb32b9525f0eebdf697f327f95447d5efa465a3b2d4f20ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://queure.ru/uplcv?utm_term=principle+accounting+1+pdf PDF link annotation
    • http://kompassztuki.pl/Image/files/vagixidasimogazomerus.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd85bb461---36390472959.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/muzitit.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe8542bb---97404352991.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/45839162404.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/99228305562.pdfIn PDF document text
    • http://anpharma.net/upload/files/sizaxufolaxop.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/benubosipupadelafugoravos.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0aab61ab---40141213056.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4d25356f---fivezowumakizovarubalute.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/75346417693.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907002604287519.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiclaph09eg3v1blre2faljf9c/65514660764.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/zenepivedapafexexuwup.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/31843886547.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jixekabufewufolozu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/38821543452.pdfIn PDF document text
    • https://netlandschool.cl/files/xijowilapigipo.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/32408353619.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/gobimanerurusula.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/96545037463.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613482171cc2c---46398142314.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/17383686605.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/jinixinivosig.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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10780 bytes
SHA-256: 3d15eba260a095bcd1409705be23f772c1998f3d4cb6686b064d64004c4a669c
font_02_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 17232 bytes
SHA-256: c8b1e678dfc9f108072ab4b01497bb7268a6a45bb1767b4238a975f2debf65df

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