Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c00ce45e234777…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 22:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ab8c89f829e3f65f5cb8db8712c90530 SHA-1: 8080a2f936ce5c95324eab6a64596fe726784ecd SHA-256: 43c00ce45e234777f39682f5dc5bf63a8ddbbf21f83ad74f807e6b8b8c6d33dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded JavaScript points towards an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://musclecar-taps.com/js/upload/files/wivirisonarusanuzenonu.pdf In PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tuzujesisojuxepime.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/37948251098.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/91879936500.pdfIn PDF document text
    • http://chayka-svg.ru/files/merixelelubugi.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/5519813178.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/48f2037d70e84410b4061105bc14e1b1/54018701395.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///70671240543.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358411ccd97---10501398796.pdfIn PDF document text
    • https://kawanmto.org/contents/files/75124528880.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3mtmk0ldvvhssbq4uar9fi1t4/70711413037.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/38415026580.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/tizebu.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jinifafukurad.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p81ggjkg4h9pt1t8p24o1r1asq/lelunefatokedav.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/waxogerukadowawunuji.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a9744aa4---dimexijujatowo.pdfIn PDF document text
    • http://fourfoods.com/images/files/32928279439.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vupiwimunigare.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/30444650273.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/02da411755b2c0bcb10a1627024e5a1e/12633951552.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/najidewijaso.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/firexovipavirafodifoveni.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/kolup.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/kowufilapabati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=3ds+pokemon+roms+free+downloadPDF link annotation
    • 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10724 bytes
SHA-256: b81fccd2a7ea889b3dd5bdefdd7c0ad4934933ef3fdba8d75fd7e55de3c60c78
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 17468 bytes
SHA-256: eb5fd99e33f82ad3d042cb60a16ba7e43e026bf0ad3af242271a671af7912249

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