Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b3cdbb83f0e8ae…

MALICIOUS

PDF

61.3 KB Created: 2021-06-23 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 18c2d51e18a416b7855322a6254061de SHA-1: 959acf9a653183233a6a6f5597cbff125eb84957 SHA-256: f8b3cdbb83f0e8ae80e6e922e2eeb37ea43940353fbf96d4382056bf48759126
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/figimosedatov.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/48ec3e6973fbb5b22188f41ecc28d5ad/domorogawepigar.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xawajafinapoxobopirunidas.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/33aaca4a39d438ad97c375eae5610ae4/6149891689.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608934f8710e2---zowiv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af7dd655064---87853834199.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/82772144786.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/fisuvorupipijisojezu.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/40065294218.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k5dojf6tmgkafegos4luisq9nh/37469934490.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68e88bf49---dumazerezanab.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nozoxo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k3t9helrk6d71pgkh1oov0pjq0/gaxis.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2abe836ba3f9e5899753e9ce179a251f/tofef.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/18460049412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=himanshu+pandey+organic+chemistry+pdf+new+editionPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 5692 bytes
SHA-256: 1f1642087053f3ba857eff4f361aace13a888b5f190dbd26f1217cf38c918eb9
font_01_sfnt_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 9936 bytes
SHA-256: 7e6ab7fffc93e8940de3740bebad14cc714629c8791835a03e1b59005faef40d

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