Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5ef02b5904ac7e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 00:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e9c5648480a35bf8c83b9d4e8cf5466 SHA-1: 03d10847cdbef4a2de730ead6523d6ffe6fae7dd SHA-256: 9b5ef02b5904ac7e1bc4233a5e34dc3f1e0a2828180a78e1e8b452083b15cbf6
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 external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=filmywap+bollywood+movies+download+2021 PDF link annotation
    • https://samoinstitute.mn/uploads/assets/file/loferoditunepaxizerak.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kfvho1sccghovsg30m03vcvvhp/57874687963.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/45015100935.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904101057.pdfIn PDF document text
    • http://darstin.com/userfiles/files/jagedanitawowalip.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908081740.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25112522711.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/duxumalevaxisowa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb20cc35c---dugazezul.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b05a2013---65776126168.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/mobevesez.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pobopidujisogemomeluretog.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61354f764d894.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613E3DBB430B1.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/xupasapukobidenidef.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/kewojuzopuwasexowuzakojo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xeperafokufaxujodelotu.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/83995403997.pdfIn PDF document text
    • https://atrax.hr/files/tidoruwuxixupafamexafewu.pdfIn PDF document text
    • https://krusomying.com/data/file/wikikovisujeze.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/72216728801.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f149b27f5---54277378357.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/molikaj.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/73671593412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130783ed3ff0---78806664644.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xamolelikebewikofe.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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 17104 bytes
SHA-256: 25d51b806390c4d5deb09278406c78ba81e91b9e15f86c4957726417de29729a
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 11032 bytes
SHA-256: 281cdc847cb3bf895147d76328fa466577649ea056df29f42c3e006e644c6c8f

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