Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9de70b94881159…

MALICIOUS

PDF

83.5 KB Created: 2021-10-11 07:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee1fa521f908e3818eac163903cd62d9 SHA-1: 01e6f682addf4c7f8c74ddfdd5c7c02ea278f72a SHA-256: 8d9de70b948811596c3bb3a8a8ce39fa89dc0b1941d184e5a0b2f2da6bf6d636
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 or are part of a link farm designed to obscure the final destination. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple links to potentially malicious or compromised sites suggests an attempt to lure users to malicious content.

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://excellencetogether.com/img/files/file/12991708967.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16162b91303d9a---pemisazujasapadu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/33536328840.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/40277980334.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/pazetabevuwanipajez.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/6514642058.pdfIn PDF document text
    • http://placc.info/up_image/11931326473.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e26e32140---79474506115.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/99828238660.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/raxum.pdfIn PDF document text
    • https://plasy.com/uploads/file/rarusafubef.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/kugut.pdfIn PDF document text
    • http://17njl.com/userfiles/files/rugorobuz.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/birufilapese.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/62554396721.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/xotusivodifirog.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jaxinadofogekajamid.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/fakajinanut.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/4979528382.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/nigevewuripitadivinu.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/76357467169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=not+having+confidencePDF link annotation
    • https://easyown.ddproperty.com/datas/files/fajedekefojegusab.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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 10484 bytes
SHA-256: a3c59c68c3f59f757af517c27c7403dcf75ca3f1c0227650c3a567bc2ce8e56e
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 18012 bytes
SHA-256: 7b03d9ef3cc01c4b744400a0a92f3aecbee5cfb85dcdbf0eded070ae3f88860f