Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2a1f905181003f…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 23:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ee2f8a22d7bf1d2295678b380087330 SHA-1: 014fe4a9dd22df4f8654aa36ec66a9c6f2d9555b SHA-256: cf2a1f905181003fa7a99e148f1c35b9c78b136dbdf357fc7224786e738b2e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://osiindia.org/ckfinder/userfiles/files/69268852243.pdf In PDF document text
    • http://aostavet.it/userfiles/files/31446622436.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/14249114652.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d80e1703---35436557719.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/xirerebakusifukukavef.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/komanalibosaporofedij.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/93173726294.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/kupufajanitupagokadilot.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/luzozawakidubusifefej.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/33268510724.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/14107894048.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/78a3f0ed23d19012ba1f4241dd6b00bc/posonu.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/l0gcciers2f4h2lm3ul4r0beoo/23691563672.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/zijukepor.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/rirefovaxunalajigewatapul.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nuperujagube.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614331027faec---vivegupetewugeruw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2eae081a4fd74e3455c96da1af5eda34/35486603818.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/pemazezajujidubebomeniw.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/64121072556.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/91992023844.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tumupumopog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+spy+who+loved+me+full+movie+onlinePDF 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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 10732 bytes
SHA-256: bd89459e0996590f75d817a6cf5cc9e8fd97cc59e26873aec2b9c1e7388cb921
font_02_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 15476 bytes
SHA-256: 917e3dbac92de767dd71db23c631dfa764a3b84016dd3147e7a7d8358088214c

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