Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f637415e6f59bc…

MALICIOUS

PDF

90.4 KB Created: 2021-08-21 00:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e2e6d54b23c80aa98d1bb2e38ffbbf7 SHA-1: e4bbccfbc1844223b2922981b44d859af9b100fa SHA-256: c4f637415e6f59bc909297446dd3e8520b9ab4ac8437caa07672aba6ff3c3cb6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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=grille+de+salaire+aide+soignant+fonction+publique+hospitali%C3%A8re PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ri8ousqbiv807k34bs7508u5k9/kogimozozinewa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/38f80b52c7a150cc85c393e797419ce9/fevokavu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/43760782263.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/50268629777.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/fatezavid.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ufkiehadef8872jkmvr52qakde/jorixeburezirofo.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/73928850659.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160948baf10e99---ragavutogesemizegak.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d46b46b59---11136200409.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-26/20210526142156376120.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cfb2d8b74245db6b0f19802013bae2dd/denojakobuvix.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/1098437030.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gadazimuridegif.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5et7lmep9jkuhek1cngd2avfk5/63997197919.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xeloduvodokarizuzufufik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611455afaf4cc---sutalimabo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/trkbojenqll291sbb8povsvucd/talobi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7296286a8---gasevokigiroke.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/45235489f094761620f22297fed4aafa/4360298637.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8d62ffd4ebbea9d4115ce322a686535b/zorawu.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/aju6sjp3jr9vf5t3ihc3pcn4e2/rugajizubimege.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b143d38f---dotoja.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/sepomifuvefeveriga.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a8f75dd0---82980812278.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8a31c301---fopiporelanidudiledox.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/bqctgepncc26r9fcsvlnac9b76/54915434842.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 19544 bytes
SHA-256: c68792c8495486e773a3ab95df623d03ebc451b63a48436e3afa1fae45fd16a6
font_01_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 11480 bytes
SHA-256: a95ba9594bbeff5e67c96317b043aa3d2650db2d39ec67505ffdd1cd174fbe38
font_02_sfnt_off00013f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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