Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed587cb327e5c72…

MALICIOUS

PDF

131.0 KB Created: 2021-10-06 22:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f1dce8f9fe4295cd0d24264c30cf855 SHA-1: 475b2ed956d6fdb3a95c03821cdcc483359e0b7c SHA-256: 7ed587cb327e5c722aba8ee1d380b50fbac9773b4e80499bacc57cc39bc32605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://archism.ru/uplcv?utm_term=britney+spears+kiss+you+all+over+lyrics PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b88242a54e---genazukununukapiriwudete.pdfIn PDF document text
    • http://potya.com/lifibudineramo.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/bimulawowidipax.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/95827727456.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/5429840778.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///vegigeturawadid.pdfIn PDF document text
    • http://theshop24.com/userfiles/file/bifopije.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b7a97835572bbc8a21e18fb39cb53b71/rikawi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20211006140844.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/zulufibakiv.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o2k78rle4a0fd2mpmju97b6m7o/javukur.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jozerikamokixoduraxirote.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/38048862540.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/40967988084.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/82466429782.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/83613388618.pdfIn PDF document text
    • https://emenu.hu/editor_up/sutelejeroze.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/gitadekurojitelaxipe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c2314ee00a8c0112c1e99f5e8cc07d4f/towezoge.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebdfd469087d13cda622048f7487bbf6/xagekovupegevikoninizo.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/dutiwokusug.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/nojuviparapujegegepojepi.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/16381180635.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/zupalisorugoburoxolek.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/dojajabinizunigevavetigo.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_off0001917d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1917D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A994 10792 bytes
SHA-256: 8184be98537b699821c293445b7681589614903e8485cc9a617292ba38457610
font_02_sfnt_off0001c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2AB 23180 bytes
SHA-256: 7c6dca58863292abe8e8616b806dd4990206eddc7a5d7769400fc7a5cc2c959d

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