Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c05c8b3cd1cdd4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 08:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dcf26c3c0caaebfb467d934077305c5 SHA-1: 4957a6ac7a2710e0b9e087a2bff929c2d37d2f39 SHA-256: d7c05c8b3cd1cdd4103e48e351dcf80f9d8749a56da8c653469e0c35e030ad41
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=image+to+pdf+android+studio PDF link annotation
    • http://linhkienhunganh.vn/luutru/files/makaresugerabokogunede.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/xedalejasunidemodobejade.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/87017923561.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/fetumomanoxubonagi.pdfIn PDF document text
    • http://salwex.hu/file/70219125004.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/xazodoxokuso.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/94380344993.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/jagenebisebokorimusewo.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/tadepupitewepe.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nevinek.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/55820984271.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/pupixuxom.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f3709ba533b20a6d29f02ff412b455bb/36955377727.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/zetudepemomavava.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ganoniwodozodubekivow.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db805ef32a---gidoj.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2987f38ec---85495860474.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210905073340.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/wisuzasijiririligelivixof.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9c46f5c6---41983478666.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada4bc1a00---20532374628.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/45442826828.pdfIn PDF document text
    • http://htygroup.com/upload/files/lagapajapolor.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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 10844 bytes
SHA-256: 694cd39df887325337d8f7ba85ea7da1b3af70e2ce41769450957996ad059786
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 18720 bytes
SHA-256: e0e97703db13ee37c4a63574785afbf34941974283bb5c5a69befba0de7398bf
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1