Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfbf94cd44a7d9e…

MALICIOUS

PDF

87.5 KB Created: 2021-07-21 12:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de9d4a31d8e2e17ed392011b95bbaf3c SHA-1: aa9cfda4672fed9cff92f50512d8e43cdd3a210a SHA-256: ebfbf94cd44a7d9ed436918403cdde462902988857a3daa93ce0eeb2ca118070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/307d78f052dfc04f23348d7818803068/31354197969.pdf In PDF document text
    • http://vuoncotichdep.com/upload/files/lokononatoreduga.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3098c101---26969178780.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/50043623242.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/26377328460.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kifugabepatolim.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/80320369964.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cc28b0f---xokejesasepugolojiz.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f5aa3ba4---wilonawunotid.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a366e80a8c---bimuponejigajuwom.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigafirefudagep.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/jiritibisusefex.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076db8723b48---xafuturixipovuraxozu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f80b3a7e8---83700747519.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/neguxalulenowumuso.pdfIn PDF document text
    • https://sanidom.pl/img/file/fobuxatafalejurebane.pdfIn PDF document text
    • http://funperm.ru/content/file/97791378383.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/mixowefagik.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9c7b0746ec4dbb1e943cd0165e909e29/povovopujiriwug.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160912fb300fe7---zagumuzemuzol.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1693cd3d96d848cb7eb1cc65ee84b183/nisiw.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/86798202898.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/20504475805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=constellations+list+with+meaningPDF 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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10572 bytes
SHA-256: 144c95a2d806b86cd4e983966f9d5642255eddd2bc60708063b487932e1c8d24
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 17304 bytes
SHA-256: 0f37f4fb193b071db82135ce8446bfa07bfd3960f177d4beb79be9dd0d701c12

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