Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ba43045f196d47…

MALICIOUS

PDF

83.6 KB Created: 2021-07-17 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2fae7418d54db0b89318287b12da7aa SHA-1: cbcfc634006771fc3e75d0bf8445b747dcc67c61 SHA-256: f7ba43045f196d47bc29cecef60123485d9b765e3fa95b2e53564b50bc83f928
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608007a268419---jivobuxonatasuziwonet.pdf In PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/20864257313.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/67101822447.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pawolifej.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/bibomu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d509664a68337c4e40789424e616d170/mizativepawobixipuwenus.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f2ac3d8f85005b677711d359e591d11/patop.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/zubukuj.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/witozafuzopipofubenevafe.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ad68f15ab4a50f6e1d165a067c15d65/90806895620.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5efd25f8c0d2662783191af815f97a57/48438600218.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b6fabee085cf1656fa4c424853aa9fad/rovamajagexixamopafu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vugazubevuwitagedowo.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b855q0op6jupk6kjhfrvk7l33p/83437291483.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86c9b0f835---46689895413.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02761ce25---76156532837.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/7023691290.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/vivaxu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e15105fa6---3965263644.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4d7817e9---vagutujalojuzuxemuvurazem.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/debikisibawi.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/kewoxikukodus.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/98270793610.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/vikepanugevujavovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=simple+compound+and+complex+sentences+tablePDF 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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 10992 bytes
SHA-256: 51b1d65e502b717b8fa90bf52c25316ed3dabbcc9d1e966ca02bcbae55f193f2
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16772 bytes
SHA-256: ce4678dd5cf82245b496a14730c20c8b06c340bc6a0489526d58e811ef40d511
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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