Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecba4f24fe5c480…

MALICIOUS

PDF

77.1 KB Created: 2021-07-23 03:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 16b25eb9684a269281d27d21a57ea611 SHA-1: 896e1a994b03db7846b2b60fb33903fa5f6487b6 SHA-256: 7ecba4f24fe5c480c7290d49c23243fdceb2d367975e72f4ce2c81f4e34c780b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://africanhairbraidingsalon.com/userfiles/file/47870761239.pdf In PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1fd95ab5e7224f548d1ad18c086dc/41066821374.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rlfcfepcv5b7aqakklst729j05/72844933220.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/348adfdd66ff8c8318f0635a335e284b/dikovotedimaweligu.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/67367669536.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/gunukuf.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/wipusuxasewe.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/45296628754.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1c6a023a20ec164e06f03e04a156b954/wetabekozagun.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5c18f98ec94f9d60e1dd6030b0c39588/nupuribol.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45c1661aa---viferimazorukol.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe589fb2f---75589752832.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba395b50c9f---42173339519.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pesikepitowoxoxirom.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/jonigapuvelovalosifa.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1c1ebb04---22180543801.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/44473711060.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27415bf15b---sofakivesug.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3a39751c---mijunerurolexadosepaf.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/rifuz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sugesezikobuzisikaled.pdfIn PDF document text
    • http://blueyee.com/upload/file/221942565656.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/rizunajibo.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/77871534646.pdfIn PDF document text
    • http://rafaelokazakov.com/file/giwikajovimeg.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mojewajiwazuzad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rich+need+it+poor+have+it+riddlePDF 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_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 10556 bytes
SHA-256: 9bc83df2655febaf13d83590cf1362f1660767399749a6185084b5a7475de829
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16236 bytes
SHA-256: 1c43839f0411e2abcec38560a91806e3352c696e26517c3d09a476b71c70d4fb