Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32f3db193088b88…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 03:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af21684ca88d78324d442658e55a3398 SHA-1: 273a85be74bf2ac62e4cb00c4c562eee35e93283 SHA-256: a32f3db193088b888c54815549a1024b0de07a19deea554e2c031ee5e771dd5c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gurukripapublicschool.org/userfiles/file/25502767192.pdf In PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/43721192847.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///buposasugotit.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/nosivetirewomegasogujog.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/962c95f1b97a4201665aace9259421ac/65070722031.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/fanofokifuf.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zunizedi.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/rejurijowepotumubewo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jijanusewadep.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0747dfb0d---19612839191.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/nifumepivu.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/rowirivumabopusizas.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/72300157596.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/fibelizezipupufugidejiko.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bidufavumejosijeseruxelib.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ojd93oves51kn46gg0c4m91k07/zezosoxoxoxologaxiv.pdfIn PDF document text
    • https://pr-dienst.ch/file/89686665737.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/nivuvovizag.pdfIn PDF document text
    • https://beaszemin.com/files/74222216212.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaee0aba4---tewowijuwezoxujoze.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/33450931959.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/fijapibitololulogazavam.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/xagamuwodil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+textbook+of+fluid+mechanics+and+hydraulic+machines+by+rk+rajputPDF 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_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 11544 bytes
SHA-256: 8df090c202176f1ec3b7914e7e18477a2f88b63ebb839a3326a999f17a278ed0
font_01_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 17356 bytes
SHA-256: f4c4b535b80a643ee661f72035121b1c4864400bd9583a2640c1c4cc75975150
font_02_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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