Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb85a08e37dc3c5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 08:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b752544f1c53ac149b88fc81456589c5 SHA-1: 19e12c3d2d93bf68aa819930ea45a588bdb16fb9 SHA-256: 2bb85a08e37dc3c5a5a3dcecc57794230c39581ba0f0d7109f55d90e8f4d2d14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.db-ynox.fr/ckfinder/userfiles/files/seriruwenosonigivuki.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b1tithnorforfij5pkt4rjsj86/76661802228.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/572edc3b582f313e4069dd2824e359c0/70770696143.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/45decc4e2459996c26e5ee65b983869f/fumenoruxidavoju.pdfIn PDF document text
    • https://asiabiru.com/contents//files/32346679588.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/latexapuzisojirudenudumo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zijor.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/kemuvimiwamaxo.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/42187848467.pdfIn PDF document text
    • http://scpt.it/userfiles/files/terenozu.pdfIn PDF document text
    • https://jensbrode.de/files/file/bigolosijexutupazuwura.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/rumarad.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/heaflqetu29hniukiil7avt2g4/68892702558.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728c2b74718---40843735939.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/96430320673.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/50306449558.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/96640178684.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c792de8e9c---3503621581.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210705221927.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/76829582659.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/5121660518.pdfIn PDF document text
    • http://christopherdallo.com/file/33530955997.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aeab5d92---568868958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vocal+warm+ups+for+singers+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 11020 bytes
SHA-256: c86a73f6dc92494fa15da729255c1cb640c1ba47653969d633fba68f4e32b588
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 17868 bytes
SHA-256: 3c6fd69ec08d55fd7a1f97ea426308d582ba0de6e34a1b2febb69b5456a02bda
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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