Malicious PDF — malware analysis report

Static analysis result for SHA-256 0505af2f1eaef67b…

MALICIOUS

PDF

97.3 KB Created: 2021-09-17 16:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2069e06de8ea88fd03b0b084deac6b6b SHA-1: d6a77017241676db2944577fff6adcd433af3a01 SHA-256: 0505af2f1eaef67b9adc3ee4b2056d1e9e954db21e071b12b1c46cb683a629ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://cructi.ru/uplcv?utm_term=block+ads+chrome+pc PDF link annotation
    • http://atdawnwelift.com/userfiles/file/69248770741.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/puwakizadigubimopo.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xizukuxe.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/mulig.pdfIn PDF document text
    • https://bloc-immo.com/images/ravixej.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/96325553991.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rogifirerunede.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/53537688997.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/69034324922.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e8c6927548e63e293454757572c9be9/dajepafiguvisofizusezibab.pdfIn PDF document text
    • https://izr.fr/files/34730449645.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/losenukum.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/tenizijuz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4fdj4ove0e5kkj9hoq0m969f92/pawubovugusamudoraj.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zetejunafumitujijulon.pdfIn PDF document text
    • http://samtekelektrik.com/files/54016503033.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef8538cba9---45728618743.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e256e6ebab---zoxezemeridu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7679c8ccd---32575739305.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614278de997a9---45712628831.pdfIn PDF document text
    • http://mobiliteit.nu/files/31776460194.pdfIn PDF document text
    • http://baove24h.info/upload/files/tedetazadexobonegaxozuwet.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138275e87cd4---mavobilifumel.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16412 bytes
SHA-256: 107dc44388bdc4da17f280f2d9ab65742b71605133e80c22a475e7e8c3d8594a
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 2128 bytes
SHA-256: 67da80f36b9d5a906396eed84e4e6eb230a9df44e0610016aadaa9f351a20f13
font_02_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 23944 bytes
SHA-256: 3e2f0ef83d4e8cdd76a283e2bc3183bcbc118c55752fabe3ea3d1c76e81c3954
font_03_sfnt_off0001462a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462A 10628 bytes
SHA-256: 55990533aaec1d9fe9c628bc4c6e8e1cf81a6cdddb5ce7294991b389b958c8d9
font_04_sfnt_off00015e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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