Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc7b22101d76961…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 17:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 744218a5f23967ccd7bbdabbf8ef2c01 SHA-1: d4ec512af5785b0fd8aa587751137b429dc8f69f SHA-256: acc7b22101d76961e03a98bd3af679ed10282cff34a5d597cf22a16ea5f66e06
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://collectifff.be/imgdb/accueil/files/97247184785.pdf In PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210906_083042.pdfIn PDF document text
    • http://wohingltd.com/userfiles/33886953620.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd81fd7c92---36166844.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/87606949182.pdfIn PDF document text
    • http://sun-eko.eu/files/file/ratosowisu.pdfIn PDF document text
    • http://benly-carson.com/product/files/xujukizutexagadufisopug.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/85768128145.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/63539357799.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/76432259017.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/kipob.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/51611548348.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/zedujirazitimimoxu.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/kajox.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39859704572.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0a1e621e---leridubewunikawog.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/94910910580.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/paloxaxixiwelodiva.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/vuzuwinanulevumiwawode.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5bfa97f01---furuzutarudi.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/wedotasizarapisataf.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/77176233487.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/5210847966.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/382715257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=idm+android+apk+free+downloadPDF 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_off0000b432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 10524 bytes
SHA-256: 16f758014dab58c46a3ae0d571121700584213f2b0620cf14f7cc7db1b12b141
font_02_sfnt_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 14144 bytes
SHA-256: 681faf2a863f6ca1eb901cf33049618ac8fb6e9a3e0e6a2fef80f71016352759

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