Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ec366814cfbea4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 23:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0fa999fb7687592f51640b8a3d5ab3e SHA-1: 2c00d2e715d662c828c2669d54c8963e9afb9ad8 SHA-256: 42ec366814cfbea4cb234a4ac1015bd1ec6c0a2a66470dfbf8e989588f225e6a
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an IP address literal in one of the URIs further indicates a potentially malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/788764ff625760d9db13e15f3a69a916/34750235852.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7e336c16---48409591474.pdfPDF link annotation
    • https://pamukoglu.com/userfiles/file/33930108579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92f0e8c3d---supisifivigitapiko.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/pitabadalekamaruzuxakos.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2200799d---kuriderovosuf.pdfIn PDF document text
    • https://blugarden.eu/file/namadosutenapovoxa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3abbc0c86665de5db1918e16298c1978/feruxedo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f19e7968eea96e35d4cbdadfd6e4ac28/vopulanujakaromobasarugi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5c2b1a90---lirapilox.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/41280289843.pdfIn PDF document text
    • https://adikmanis.com/contents/files/79602782418.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/94715029547.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/menawugi.pdfIn PDF document text
    • http://fourfoods.com/images/files/32928279439.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60290691409.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307bc54ba7d---nitamilemifox.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905030341.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/kozunezilu.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/muvepinigisapiruxokelidu.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/bikutetixipajivuf.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/wosamagafejubuzurokowezo.pdfIn PDF document text
    • http://grossbuch.com/upload/file/jumixafovebajarefofisuzan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anime+apps+for+androidPDF 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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10496 bytes
SHA-256: ade9edf78737f7ad488db079f0d65a7339416efda9b8ae26ac1754418f82b2bf
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 17756 bytes
SHA-256: 0ff0042d90c940b60bc3e880159f3f02d5a60deb1173c0e9a09486fc23ba4f5e
font_02_sfnt_off00013259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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