Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7e363b0d2e2414…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 03:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57ff96f24b09dbd7ef3a5ddd28cf2efb SHA-1: 500c5b38adc54d2dafec2acbd51d9f29b90bc505 SHA-256: 8e7e363b0d2e24142e299fc61c672323bda5b80186f36f7adc5ee103379ab206
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm pointing to compromised CMS uploads, with numerous unknown URLs suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect 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 http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121503363e12---ripigixenizil.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/nolatufixitekaj.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/21969415881.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622666194.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/67191462808.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/fupotareferuma.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tapuwusojekogedufone.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/sajijibiferet.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0850eb5e---mudenuloxobidoxanewo.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/basubimemiburerugosidev.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/navadifigobabek.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/38003784008.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/rekawagiwuxejinufesobub.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-18/20210618022126136797.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/womevupe.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/gifikulevizarubetirizuze.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lugoshou1avem86akf8vdrnmni/24793228384.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/52836498091.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af4b5f640---83603246463.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/46389073963.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080289278bf0---87124175610.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/6776463475.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tk9kfojj1rv54n5njs2re8gsje/roxiwadodokazaviv.pdfIn PDF document text
    • http://chapelguild.com/images/usr/woliwovijivigad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rush+closer+to+the+heart+tabs+pdfPDF 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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10804 bytes
SHA-256: 3fba5ba4c3457cfde2e1f3ae6268ef3199d1eb0594c855a45dc95722b270e0ff
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 17628 bytes
SHA-256: a4ffe62cf76219f6dce6b4a00f3e60081f63dbfc6115a68ea04efe5495627c97

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