Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf483acbf555ebc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 05:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24cf883b391ca975c2d04df354efe89d SHA-1: 7fdd697ffb76bfe439abe4f2108695af691d1eff SHA-256: daf483acbf555ebc95639d0a4ebce802336ab89e1e86c777d3e8b0b871b5882e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic or potentially host malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the structure aligns with phishing or malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://julianowka.pl/ckfinder/userfiles/files/morevunogurobomisa.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/49799354973.pdf
    • http://transchem-tech.com/Uploadfiles/files/foredotas.pdf
    • http://scea.edu.mn/ckfinder/userfiles/files/39633442605.pdf
    • https://gitedu.in/ckfinder/userfiles/files/16481218093.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/59593915730.pdf
    • http://yao-cheng.com/uploadfiles/20210915154710.pdf
    • http://backkwang.com/userData/board/file/51606852304.pdf
    • http://www.eatvirukai.lt/uploads/files/52721081906.pdf
    • http://yongchengtech.com/uploads/files/202109060418048108.pdf
    • http://ecole.ru/text/images/file/xemimeruxefidupel.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6bb06704e---32393008420.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/gimakorukatamipozinan.pdf
    • https://biomedchita.ru/imeg_master/file/70263815340.pdf
    • http://konberdbio.com/upload/files/86237521303.pdf
    • http://sangjeom.com/userfiles/file///60284848718.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37977536135.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3af04c77b---sipemekodawijox.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/f5sa4l6fh6ub02pf1c1359m86h/mudilinesivu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mxq+pro+4k+update+sd+card
    • 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_off0000e3ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 16792 bytes
font_01_sfnt_off0000fbc4.bin
773c5a16a38582bcdc1535f6abf300f1876da03062abdc8a6f4e1d834a71b175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10776 bytes
font_02_sfnt_off0001149a.bin
68a50164f8267ed387dc086d34389acf8db7105fe02d52d8bb091b49d9cde5f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 18388 bytes

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