Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dea21d16c522b85…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 21:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94223d7a99093a6d6ccafb05becbdf73 SHA-1: 7f9b2e9f5260ea5614d4e3fbad4c4636f254e166 SHA-256: 5dea21d16c522b85f25c7063be731426f137e10c7b9eea8fc06da16fc4c697d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=quantity+surveying+notes+sinhala+pdf PDF link annotation
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17952a01d---sugega.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/62528620608.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/54179372538.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/75555624126.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/labekubeve.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/48596950233.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/36447281986.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/mibopan.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/17671267441.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79c9661e66---jidubilivowusax.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/kasijaxolizetewaz.pdfIn PDF document text
    • https://belloverde.net/emailer/file/1927590914.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/budiwemo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/43665649602.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90c51aea64---68713062289.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/864c02268acea0b280d1592a7dfe51fa/12380544462.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f96049850---25658906282.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da1f7e03999---15771484862.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/zakupivovigini.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9aae80b5f---gozidoji.pdfIn PDF document text
    • https://studiorampinelli.com/file/34815917022.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/09e40840c349769f9127f5ddd6332c28/45581926058.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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 11116 bytes
SHA-256: fa9bae6cad12832c451c177aa086f29946d8877e9f0420b9ee7fe88ac59238a3
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 18192 bytes
SHA-256: 42fd082167f554f9930635606151f8ccd8c9e7e11c416e549be4996f9bf30bc6
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.