Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dda101f7dc2c66c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 17:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb3f8c97330ea0c6bfe5dc814f777508 SHA-1: 6553d09c69f4ce7477eae8aa3ce50bede2e71690 SHA-256: 1dda101f7dc2c66cece666ad361b28f5e68db71623ce4c5acbca0c0c3bde43d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The primary goal appears to be phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=dark+mode+for+phone PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a402b467ef91b93259d54c0e9d46045a/nuxap.pdfIn PDF document text
    • https://limsurdua.com/contents/files/14845470366.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/91532146409.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/9325255677.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161356bec5f045---dufifuronufexizuwukezuk.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/wixufo.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/natebimun.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/84396571118.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/31236194054.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/lipepukanikeg.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/salomubesesok.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f059eb3cc---bizugevak.pdfIn PDF document text
    • http://seto.cz/uploads/57020332269.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/93009701984.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/tivagepepamemakizedefutov.pdfIn PDF document text
    • http://tykhchem.com/upload/files/wemijozuwebudelowumafi.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/fulopekobibolulumawelu.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/71055418536.pdfIn PDF document text
    • http://cutskytools.com/d/files/vativirafinet.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5077b103---59652630914.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/judupotanusijav.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/tikeviwiwipavekozezo.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/nirenilebawenurap.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_off0000c65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 18104 bytes
SHA-256: 1626fec4e5ade5a8351e4ce100b3c85fd7195fff92e1a9b69882d8f5ab3c42d6
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10452 bytes
SHA-256: e755d9b9266468a1393d6bdfa34ca5d373f3d0323aa2721f3a7df027027f7048