Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8403f3efc2f465…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 03:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da88a099abebf9b770d00437c0bf2303 SHA-1: 0024c50d507bcd71c56cb67b70435f5aad12db51 SHA-256: 1f8403f3efc2f4659753de0e028115de654fcc12e3632b332b306a98225944ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external domains, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, further supporting its role as a deceptive container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sukhayurveda.in/userfiles/file/kudakejefagiweg.pdf In PDF document text
    • http://suchanekstomatolog.pl/files/file/woxisarizoxesigeloku.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/59257662107.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/27681444093.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/ronegaj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428a0bcd198---73532259863.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/62573438016.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4803f37c580a9e26ff65fc4a88eba601/nogeropagowow.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/26838559193.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/jimugatelejodan.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133e915ba33e---jivulewunase.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/mosezovopamulosivonil.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161420fdd2643b---69488661641.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/52924971836.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/funuruvoma.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/41174071576.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/rovuxowof.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/40821995785.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/3229054768.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021092217581173499.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db0dc1f2a4---50244705348.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a1535e44aaa0b422ba54dbdbe341dbd8/riwuguvizovasoraji.pdfIn PDF document text
    • http://chinazzjx.com/d/files/56114280919.pdfIn PDF document text
    • http://chaireyes.com/v15/Upload/file/202191716302852.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/32920368102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fzmovies+downloads+2020+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 10640 bytes
SHA-256: cf428ad7790274ad90c087171a01a5e5645dc4b7dd1e5d5ee175eb8b3b8ec443
font_01_sfnt_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 13948 bytes
SHA-256: 550898fc6b8d3fab995e9bbeab35e70751fecbbbe035a19e339973799c70818f
font_02_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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