Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93fe7e2fe576707…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 16:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0240662bc144662193bd83f69c2a701d SHA-1: 05b2dd5d5978b2a0c0178331d2f423cfafa07eda SHA-256: e93fe7e2fe576707b364573608bf1d9604a6cfd4c2c133a6ebe7193296222f57
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some pointing to IP addresses and compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The document body is heavily obfuscated, but the heuristics and URLs point to a link farm designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gonouvellezelande.com/files/31638835150.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138577007f2b---15430079046.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/72599230887.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/muzidepuxuvetudebubizalo.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/67746821487.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/bexafakadisafulax.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/490fe0c282a0393435e859a8e4b62dae/26033361342.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/15584813705.pdfIn PDF document text
    • http://zzquansu.cn/d/files/63687964279.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/10241951251.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/samuferebome.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/xaliposelebefigaduviki.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/41804569495.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/logopadapagu.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/46183462437.pdfIn PDF document text
    • https://baongochoa.com/upload/file/kajesoduxeluw.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/77872013088.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c0001fcf---23696795538.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/96130331308.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/6341764927.pdfPDF link annotation
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/wodebutesema.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210901_195151.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914072955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=we+are+number+one+roblox+idPDF 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_off0000bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 16088 bytes
SHA-256: ce3afb0a35743964a4bb386eed6df2feef6deac0e9458ad13764aefad6494497
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 10476 bytes
SHA-256: 4d206a4d217c1acea3dc3127f12bef4331fc72411a5c766ae1cb60e29a0e5a94

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