Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e59e088448e3c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d865150dd7c76e30d64662ae97310f3d SHA-1: 53ea30b99759875e1a774848a36899ac61efbdb6 SHA-256: 857e59e088448e3c56bdba0ab280318170e2ccffeaede4ec7ab415b307f2acac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://aumnat2car.com/ckfinder/core/connector/php/upload/files/81193091384.pdf In PDF document text
    • http://bhartiyambeohari.in/userfiles/file/riwebatogupirilenurozu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/kisuzuj.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/megurozerisemox.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/39150855575.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/xegejewimarevada.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec5727b44---63287508009.pdfIn PDF document text
    • https://maturana.cl/upload/file/revipapozobotegananudamus.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/wejusebopon.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6d3deef940fdd8de7061289db48e8f47/3850151584.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/23ee7acc5831410778efb1d7a8815fdf.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dopawepokosowowelisabep.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/72155155645.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ad053f43---64707278247.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/nedanuzumuvetekof.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/58449382199.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/46486265264.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/mitexerovirod.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210908142312.pdfIn PDF document text
    • http://aquatherm-graz.at/files/zozazoxuvesiwotasaluwetix.pdfIn PDF document text
    • https://krusomying.com/data/file/57898906081.pdfIn PDF document text
    • http://houselandia.ru/files/famoromoxaka.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/23100119394.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/denofikigiba.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/38179688677.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/75615288106.pdfIn PDF document text
    • https://mmtours.si/uploads/kimakujejokuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+hacker%27s+handbook+pdf+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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 17976 bytes
SHA-256: 53d92996f16a24e6a37001005e1a731fa39b959c2eea642f7902a9183456aa05
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 10952 bytes
SHA-256: 665237b0f89d6e5e6f5e1fe7cbe56eca8e0c4ceddfd8f4a62c45fb55dabcdeab

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