Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e8ef54ace4eb93…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 07:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a5d6e39d933be22e2a02ba4c7b4973d SHA-1: 96db6d3146ca82b836051ded671612e8067087f3 SHA-256: 58e8ef54ace4eb93ebc5973654faeb38b40d0fc5a7d37aa787783312cd6cd0d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ketchas.ru/uplcv?utm_term=a+beautiful+mind+study+guide+answers PDF link annotation
    • https://bataretak.com/img/files/file/66809532160.pdfIn PDF document text
    • https://dalba.net/other_files/File/fixozepaki.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jotabesidolerevako.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/17138587466.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8a2209823984af1966ffc1744e1abe1a/zuzonora.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/13404800802.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/kikegudexogezun.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b43518cc8f1---dotidubamajegiwolij.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624152904.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/tadafepuxolikuposodazo.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/judagulumipupagi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0addea93c---63319631122.pdfIn PDF document text
    • http://islandpointfl.com/userimages/sepabogo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052910431673499.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6jp7h330cdv1et7apjr4cs8s31/58363235646.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/17d197de9e2e0c2e7820196afcfb098e/45950731725.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/luvozitiwibujukoje.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tikujuf.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5d400a6ab7b31afd708ef7e7e8e2b0b6/51692176513.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/49149231417.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/welelivifedukanu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/46df5a14ce2327241295dae5a651d0fb/zulewasudo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da2e234c3751a6cd64eb2e8e8c2fe414/2041069493.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 17484 bytes
SHA-256: 1565f5669c8e690bf47c841acf5a4a1cf7723487ca6ef2a11bef80829dd01a3f
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 10996 bytes
SHA-256: 5963e45758cdfc79161e58874c3b063faf8bc1f5e6a19eb9e505a5556dc3f70d
font_02_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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