Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd874ce084e6a20d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 23:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdb645c71f849ccd8e70c442f2694e87 SHA-1: d042ebeee7079e7cbceb1fcd8e5e4d32a46e6529 SHA-256: bd874ce084e6a20da81cde4185c4795913f5568baa69b76810d3cf1a0d597e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=open+gpx+tracker+android
    • http://donauwell.at/userfiles/file/fewatagame.pdf
    • https://bizimpin.com/calisma2/files/uploads/sogupofugawazufi.pdf
    • http://anapro.com/ckfinder/userfiles/files/duzomubebep.pdf
    • http://biosurfest.com/userfiles/files/xejojegogaxag.pdf
    • http://phupmirpol.pl/userfiles/file/duwubumufamagomev.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/kegipifofut.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/buliwaxonilirefalu.pdf
    • http://studiobonvino.com/userfiles/files/lupodo.pdf
    • http://pobierzplik.pl/uploads/files/pipukiluzikavutal.pdf
    • http://soleilboo.com/images/uploads/files/23574998989.pdf
    • http://craj-ops.craj.cz/soubory/40960053085.pdf
    • http://augustaelectricalwork.com/editorData/file/61603122651.pdf
    • https://ww150004.linebot.net/upfile/files/20210910231300.pdf
    • https://wonkingchina.com/d/files/radozigufavaroniwuduwot.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131228437aad---4657582275.pdf
    • https://aarhuskortet.dk/images/file/93947488934.pdf
    • http://originalcheck.it/public/img_admin/file///wupuzoxibu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ffa7b0c5bf8886f64b2c84e6ecd07d69/rodupafup.pdf
    • http://cnsgafgl.netsociality.com/upload/files/wokobuxurom.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613600eb8b8eb---62334123302.pdf
    • https://luxm.pl/userfiles/file/fetapopizivujojikewo.pdf
    • http://microcement.ua/userfiles/file/74654768721.pdf
    • https://ashleymongolia.mn/uploads/files/24717412553.pdf
    • http://arniuniversity.in/ci/userfiles/files/86507297624.pdf
    • http://i-harmonics.com/upload/files/zopipejozimebapuniz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb5.bin
d91a89ceb0ddf16d7fc7ec3995ef56e4e8842e17b27d07dccf24bc94ff88edf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 10696 bytes
font_01_sfnt_off0000f53b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 16792 bytes
font_02_sfnt_off00010d4d.bin
dc1c035ca56eea034a727b900641a617a5d2657ded4b47e5648441643f13a148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 17060 bytes

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