Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8e63e16d4d552b…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 09:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6769edacc6e7160ed7f85f19ea496563 SHA-1: e9c52e56db7a3c1dea24913f872cc76b84152e84 SHA-256: 3b8e63e16d4d552b752a2871e4121e301a1e97908296050921a12b5ea1c8d9b8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://akvaguru.hu/user/file/54093221731.pdf In PDF document text
    • http://arniestribu.com/campannas/file/91751917783.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kuraram.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/25045385982.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/40vtsfag8tpiv8keu7r7ktt7ju/wimeremiwax.pdfIn PDF document text
    • http://strandedtattoo.net/file/43798728297.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ab293091---xufugiwifi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5d2d0e7b---mosolo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3c61899682f10c0bb42ad342e3028f22/xululajupupozidiwumerif.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/64421215766.pdfIn PDF document text
    • https://airbays.com/userfiles/file/93559799344.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/80380424985.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8805fa6749---55306724457.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/59006178524.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa1def4d9---pewis.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d3148fc8---xatamorudozuwemaguki.pdfIn PDF document text
    • https://europartner2.pl/uploads/kodewe.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/sezudamadebewejumak.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/16327269755.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kolog.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c06f20681c0---mipukeluporololedutule.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ba64d1f7---jeretorutesetuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=security%2B+pdf+study+guidePDF 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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16612 bytes
SHA-256: 00b02e3d6213b4b94b95bf681bb596d4cbe5df9fd8da8b5075f033ba4a97abbc
font_01_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 10652 bytes
SHA-256: cd0925b1fc6c4c109d25a26a9f4c964b7e5168968ae46a2a9dd8d00761f9d147

Open this report in the interactive analyzer, or submit your own file for analysis.