Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d912e77e9215987…

MALICIOUS

PDF

103.5 KB Created: 2021-06-30 21:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61bfda27fcde5ff84197109590347ea5 SHA-1: cbd60f630f269518a4b7dcebc04618a27402284b SHA-256: 5d912e77e92159871b15ee6775ccaf7e9f4075dccf5006039669bdc6159c736e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though not directly executable in this PDF context, is often used in malicious PDFs to facilitate exploits or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://krisoc.ru/uplcv?utm_term=belly+dance+drum+solo+music PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/032841297de78cbacde9116df39815ba/badake.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b6d46d063f5571f7b6abf38e4bce47ed/36747899283.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa55fc3f21---54399629996.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b242b1a41f3---zaviriwovokotubanur.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xuzelovimabuzaxexawivuko.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa059474dde---71621396680.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/37307777539.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/miridunatelul.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7dd757f8f---13454240378.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2198a5b98f---lunudewodovupapukotus.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///lopijikixuxakano.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/16751775970.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uirpicg64g6kqliorl5vg91oae/3621458141.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ghvj6cs1861p77lpfbdct8d3rj/zufalirudexujazivu.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/vasefutakipepegesumebal.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/158eef65748c01e1d4f2b39ca37f2422/zozazeneretebatimejoxig.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gumoluvena.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c99cb4296---lokik.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/17mo57nrv0qmchio329qu88ib4/12818317211.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hbfo9n3rfhorkv4aorov0dci82/nanewila.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c432b2b8f---70716552953.pdfIn PDF document text
    • http://vejwun.cz/images/gonilesokij.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qgsjnjcig0r9aeq3ppt3skh411/16827467252.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29976966248.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/rakaneginebu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b53cb338920---vomofojen.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012a47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A47 17660 bytes
SHA-256: ef70d14aa9d02f8e51e44471e55338ad256f3f322321c110fffb427fbd1b9d74
font_00_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 19904 bytes
SHA-256: a06eeaaf88fac65c024dca1b19ef7acbafa52d4e8932b04762ff4749221d6f3f
font_03_sfnt_off0001778e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778E 10700 bytes
SHA-256: 762823c926c11300b245224a9237938fc0bb0073edb40f9b6deef8d2181d3896

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