Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c16394a65e173d…

MALICIOUS

PDF

90.1 KB Created: 2021-09-23 01:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80ea04673f540870214b89348cb89129 SHA-1: 5f7d66034576f40698b9a1d3f7c0ea542d674bc2 SHA-256: 87c16394a65e173d33218ef1a4b27fcbae02ce43d8511142871d9759a60d4cf9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kingdomdatesuae.com/userfiles/files/zovedapotuseza.pdf In PDF document text
    • http://pieseclimaauto.com/files/file/17319898027.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/94455945711.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/98514997329.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/gobipum.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/xuruvetopusitoroturawa.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161422e1490382---29936456785.pdfIn PDF document text
    • https://salonrewards.ca/images/file/kujugusajatidojali.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/19867687817.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/nowudem.pdfIn PDF document text
    • https://duel.pl/userfiles/file/xinuk.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dilezu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wukebabudi.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/7442225736.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/dekokanilom.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/45680066800.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109102302558905.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/45066262733.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xigaxejuriz.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/vosabuburumovikifelok.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/56314587107.pdfIn PDF document text
    • http://oris-am.com/editor_up/pajuzomotunivujuguvis.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ae2270494759a689e997a9ad3a4cc699/kalotisatedixewu.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/gurorilivem.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0bee272d---kasuvubexuwatupotuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=friends+with+benefits+watch+full+movie+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_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 11108 bytes
SHA-256: 69677fa523450aefe9a85a18e012fbc39198b96f5e5289c0bef1b18b93ec8fa5
font_01_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 17596 bytes
SHA-256: 4eccc615850e81106f94a543d57e14f8c7169cf5c45bc5bd8b8c392a2fefbcda
font_02_sfnt_off000141e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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