Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcc38a78fef154a…

MALICIOUS

PDF

77.2 KB Created: 2021-08-15 04:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fb8a8e42ff4d360ea84b7d24f90aaef SHA-1: cada154d38f022e50dcaffd1336aecd16a3df4ff SHA-256: 5fcc38a78fef154ae9fd4390afe4657095522e1f7f97d1db20ae27bb4e4cbea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. Although no executable scripts were found, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://nanobubblevietnam.com/uploads/userfiles/file/81587477111.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a312c4fe2---71677541728.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a9881a7d---boxesebibifoketes.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/36389203054.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kukkhhob3kq3q6jnfh1nhnrjre/fifijopozoxavoxevipuguxok.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/zibaxi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed55b1a255---potofevis.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/a33csra65u9kihvanmaongbfo3/tokamogavujuzu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41d7a6cb2f---57192604814.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/25771692979.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/lisoxeliwaj.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/96951627696.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/84407685506.pdfIn PDF document text
    • https://kildevangen.dk/files/39957594374.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1412761e724bad627e7217f66d60af6d/12514982085.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/96979794337.pdfIn PDF document text
    • https://securitydm.com/slicice/file/28194412841.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc60811cad---dolofufenasagipux.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9uu3rq4l1r4vbrjs99mg46i2bi/nuxalezorozowotilopifelu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/449eb6c14f17cef62d49e0516117bfb5/33388702782.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/34894461911.pdfIn PDF document text
    • https://coluer.ir/documents/file/karifoge.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098772c3d554---tebenuzoduwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=exercice+sur+la+quantit%C3%A9+de+mati%C3%A8re+seconde+corrig%C3%A9PDF 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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 11352 bytes
SHA-256: 47670af47d27c5b74fefad483b4aec03392d1fd045cc2a46788f332908fe06ca
font_02_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 17228 bytes
SHA-256: d448579ea2edff8d4e66032f1b66f0556008cd4eb4005c800af3b3e64f0ed7bc

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