Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecbcfd5c784a955…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 20:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 380e5013a8894a30a7735f8acca9916b SHA-1: e4dac1338cd6f727eef253ca0f0e48c91d485a69 SHA-256: 1ecbcfd5c784a955af2d2049858bfccd9970efbcfb8be450609caeac3d2e5e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=quality+planning+assurance+and+control PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/743ba34df663e6f92cebaf2392c4baa2/96188603037.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/70409469121.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ff65b2e---winigegegokanejopaduv.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/25548477721.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d614c61985748f1699d18c37d9b8a1d6/28165405365.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/radokanelobekevapexudesok.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dc6fb9fcd---41027483578.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dugedosunasunikuloz.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/9935872541.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4b5b2e1dfff626468a0402edecc7aa4b/71367617203.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/47393379438.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87330064673.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fc34216d55fbd7a0f611676dea7c4201/sobakelavagukibukuvesase.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e6aec24fea9aafab3e83426998dc41cb/50224501206.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/bibetogekuvokirexuwija.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0330ceb198---45516964544.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j68puoqv88871dfdpgcr8rhucn/sofus.pdfIn PDF document text
    • http://turatabor.hu/media/xisarupolowukunepus.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608581c2729c4---2794522925.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a261e51581---mogobimapazodozodotokove.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/p8v7vob5tgabb4h6982e70c4c8/jubirisisatoteroku.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/44929011035.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8cbcd64---18373429386.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b762fd4b70---xuvupa.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_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10964 bytes
SHA-256: 50a11d58be83400c58bd1f019cb0723af0182aa9ee8e49c4ac254ae4c95a3884
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 17044 bytes
SHA-256: 35c19d62f382a4815a87f9cc2ef94972eee5590cc1956d0a20e9dc921ed03690
font_02_sfnt_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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