Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fdadc8bd521256…

MALICIOUS

PDF

79.1 KB Created: 2021-06-20 00:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6707452186040115b467307e987cded6 SHA-1: 1cbd3dd0d23a2eb31e2228d7b7470ab25aea5417 SHA-256: 24fdadc8bd5212568899d8beed74a7d347e31999d870b127d8ea1a5d4e0452f9
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/bbd9d57285f23502422c8fb0b1fc403a/zujokekotobewizibas.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884fb9bcfe4---migexuti.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/489388d1206db736246a8e18ede1ddf5/vovidilokizejigefix.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ee077318---42435056414.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8198f07c6a---55668562790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48351cbf1---jelolisopovupigodunemez.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8e486a1f---wikolenowav.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/62uu1nsja022svtv6hb0nll1q5/42417766023.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608746602e495---98618355591.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/41e0860f91b28d604e6787b7ae540eaa/figisokaf.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076476f143a9---xejesegaroremibanugag.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/85774408293.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8d3f7483404eaee32cf67a833ef720e7/poweruwo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcba9822c8---nixerisitetamakoj.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/volitaxejijejumuxaxijuga.pdfIn PDF document text
    • https://securitydm.com/slicice/file/besugimexeguxezeragofeg.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/52497187562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=xxx+age+16PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 4240 bytes
SHA-256: d1c5ff9edbfdad6bfeb13eda1fa2f75b6b40c9a70fc72591a3700a3ac64b1c10
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 11412 bytes
SHA-256: 3d56b5c718a0e74b256d078c540cbf175cd865f2a2fce0c8608423065de2451a
font_02_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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