Malicious PDF — malware analysis report

Static analysis result for SHA-256 8565835aa8790780…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 23:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05a18578f6ba827389899767f1c894f7 SHA-1: 7d77e7035cc04af0ae67f69a3411425d3a0da480 SHA-256: 8565835aa8790780c0da964717bf0cbf4c5b0452662b61bef1ec09cc96c5ef70
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristics and URL destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://erdemlerkoleji.com/resimler/files/43191076449.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35dde6f9f---bulepewixozexof.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/2085245456.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161370bafb72a5---92843316243.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/8369161243.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad8f383d8---nagon.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/natuvizonopimuzune.pdfIn PDF document text
    • http://jonme.net/ckupload/files/18909769653.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/69547319965.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/fukoragefewebadob.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/ponuk.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/76219615239.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/80391447403.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/2698610316130773364bb3.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109091809346029.pdfIn PDF document text
    • http://baoveantam.org/upload/files/58407506667.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/45623767281.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xokanuwuw.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/35526734448.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xopapabusukefani.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/ronulunanu.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/90833537175.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210911092703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rupaul%27s+drag+race+all+stars+season+6+episode+1+watch+onlinePDF 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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 17012 bytes
SHA-256: 3f2326bb70cd9e535a3af1d78f6e84b87a0eec35fbf19b261047d2cee1ea9ad0
font_02_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 11280 bytes
SHA-256: 04fc18414176a42afe792556777f5950503b75fcda138b1c3e6752dbb76aad2f

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