Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf1f513e897fac0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 03:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 56d34a7e2fcb173a69389cc25875f09e SHA-1: 5063e176bb904e78a568f6bf4241a1e37a893389 SHA-256: 9bf1f513e897fac0a8e3408883c8b29aedde600643fff7bd39b6c7afd528d2cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. These linked PDFs are likely designed to lure users into phishing attacks or to download further malicious payloads, indicating a multi-stage attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/159c38b7396f9b8cb6605aae4ab1d4c6/zumajipuzodemiba.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0a5246a168925e2e9f75f3816cc07418/93980177862.pdfIn PDF document text
    • http://thedreams.cz/files/jabaxepimefezokidaxis.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qjg5dr1r35fg6iaann1ksgkhq2/7557739549.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/51qe3ha2rfdhpqi4qd58pf9kj7/dizikav.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754d91cbdac---4130645642.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/adbd57129bf1e8e0ff8e8791e97c2b5e/74452775675.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/139369793291626219914.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86ce3778a---69931818915.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/59812162736.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ea047f4a3d4eae630410ec7eb3944235/tidumojifipovufegagubeso.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f8ef4dffaa3ff1ad8e841b1faaba0459/kiguzelubutudutofobe.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4110412075732dbd72c74d9362a18996/nixeretuleleso.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/bunijijojovosuk.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cc04a1d398b5096eab7c6f5f2a96be4d/godad.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/39211702091.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c9fdb4676617f7c438b0e5d167a71f13/86599150656.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d917aa76e2ad3477f7328c8d5044cd06/togosalepazilu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cdb87cee6310ea48ffdf1b11add520c9/96505934385.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/fogazefovosozavogedozo.pdfIn PDF document text
    • http://naucseto.cz/storage/fobonafugikukobufevir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=red+and+blue+3dPDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 18680 bytes
SHA-256: 7317b5d434ec4c5120910c75187690fcf17f2ea45ac94098e433668574e74ee1
font_01_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 10120 bytes
SHA-256: a0e01ec0cceccd7b41096f32634a45b577a21b7541cd9f03f2e0c14cf4c911d9
font_02_sfnt_off00013278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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