Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd29d9f7f15a4fe…

MALICIOUS

PDF

98.5 KB Created: 2021-10-20 04:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13090c41ed5956b6839e8a2e6d372280 SHA-1: 0ebb6c123f7c1c9e79b08c5d5766b5cd7614a2cb SHA-256: bcd29d9f7f15a4fec682551bc1cf6b6370d5d01c79d334ac2630d56c976a0981
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://slovoveri.org/userfiles/75781436792.pdf In PDF document text
    • http://mweb.cz/images/file/nipazifezewov.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/55613138853.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/rujewoteg.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lobin.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/nukokobegotonegukese.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/39858068421.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e29e9cb4e301fd9f94f7e16f9fafc038/fagemevitulofodefuxe.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gatureborabujirudaga.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98132752879.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8ffc4f6b---jumejuwepejoxapepafiba.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mofofa.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///61668471485.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/78686874767.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16315448327da8e5ed4f7a6ea4c8.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/23607307342.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/34128459689.pdfIn PDF document text
    • http://unsersohn.ch/images/file/tigobumiduzewukobirim.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/50399795871.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615912c26696d---52582551159.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/63682652877.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163a146b37bf---zojopat.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/37qb8nh2qi49odtbrk8u7qdjq3/walanosifuzirogetuvisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=ielts+cambridge+11+test+3+listeningPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10908 bytes
SHA-256: 13839faaf4c5fe346e75eaa5f5f9d081cf9b7519e05c3c1111a042df3924efe4
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 23472 bytes
SHA-256: c50e748fd6a79d5dbff4d578142d82e73d6e8b40376558ba9b99d69b8bb1673f
font_03_sfnt_off0001637c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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