Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d53c6babd6ae11…

MALICIOUS

PDF

94.8 KB Created: 2021-09-22 21:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 037e4be23c745bcb75478127191c5706 SHA-1: 204f46a3844e5855f4599df082c31861bd0e3075 SHA-256: a6d53c6babd6ae117a1f6b8df7128b6e1873b81e4a53e13402ec0f6502b6d80d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the presence of multiple compromised upload links indicates a sophisticated redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=sweet+home+3d+software+for+android PDF link annotation
    • https://maintogelonline2.com/contents/files/21502137117.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/peravepupixelakeguzixonil.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130de7a443cb---tomaxakezinojonelaluxof.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/zufawinidepin.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51417277---21883469656.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147c97c69922---negoseliwasilojevadas.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ov74e23eg3shf1a1qt7rvl9j5/xaleduduro.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/vagufovidabu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///94874837663.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/82977037474.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/85338456341.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/38873174277.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/181825283350.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/20617951947.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/25128570686.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/86969745674.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/87262965814.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/18662685313.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/golukaginikopikuvib.pdfIn PDF document text
    • https://atiksigorta.com/files/49031663569.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5078b19bceea52adc0bc2250488fbf8e/38854519369.pdfIn PDF document text
    • http://happy-land.hu/editor_up/vamusetupebulopazidek.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///53234453559.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/73187172900.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_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 10904 bytes
SHA-256: 54a99b33684c530846c49e77350afdcd6063cc5c1c5fb3014626d59fe19f8959
font_01_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 17052 bytes
SHA-256: 9926cef96fa486f7db5584d4b5be4de594ddd4abc0de96c4a7375979e6e4755e
font_02_sfnt_off00015536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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