Malicious PDF — malware analysis report

Static analysis result for SHA-256 8638633061679d43…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 22:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4dd136fa6a640802bcbd1ba03c5c8414 SHA-1: 02391ff1d2e35257d139054339735dde95600635 SHA-256: 8638633061679d43b157952ce5f9ab6b732a2084add29c8d55b3a5400ddc66e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/pazemepobofodosit.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727174b6013---52856498504.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/muzenuvifovejo.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/gomuramo.pdfIn PDF document text
    • http://chineseclothingonline.net/File/molinagubutakedaderipazi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6c179c1b2641c486e313ecb54d4f0ecf/fovovidepiz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lhbqlrnk6teu90ufb1ij1hs0js/vabibiminux.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/ponukekulapipekezebe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8522ab8335f6d1d1259134ac5f1b8b1c/rimazenu.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/guveninakopa.pdfIn PDF document text
    • http://asustainable.com/global/file/93509761927.pdfIn PDF document text
    • https://tckontrola.hr/files/59102659284.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/564a5787a25fbfa55a4d3a6326ba5132.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f6043b5d---saboxeno.pdfIn PDF document text
    • http://iccarrentals.com/files/file/76203263204.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/94700582237.pdfIn PDF document text
    • http://minerva-collection.net/files/files/benudezoxakife.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/92430185294.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/foxonunav.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/99313901646.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/u6jn2oo96udbglep5mivvvgjs5/tavezum.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/niiunnsfsn38q5m1svdhshoa1m/85300552672.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/medove.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/sifekumapibenowunodovike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=6+man+flag+football+playbook+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 20120 bytes
SHA-256: d24113cb4bb10cf8de268641f0884c46659c4ffdb3f9252ee4f50ab18e8bb467
font_02_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 10768 bytes
SHA-256: d082483786497d5b76c97ae644ef443ed36ac8a9971ccf1eee61d2e1a7e2be27

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