Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6b4ebcdf80845b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-11 00:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73ec2800e60fb69303e39fd0ff45035b SHA-1: e082eceb90aa10f829da55aec0194df1ebc39c2b SHA-256: 3b6b4ebcdf80845b6fe33b47dd1f3667e084eb2432108cdb75bc6f44b534e601
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e998f293b3---nelaboxisobezido.pdf In PDF document text
    • http://tzoetemondje.be/uploads/files/92287616468.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/082315511788.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/90677714395.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161372c5592098---77653633605.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/98665274053.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/92083333279.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/potedavi.pdfIn PDF document text
    • http://coumert.com/images/file/44776997446.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kevuzibigarezoge.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/12984409875.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136109986f42---49878026017.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jixixodilexuremupiwawo.pdfIn PDF document text
    • http://btfa.tw/upload/files/63832327566.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_DE99C114E0B9A302.pdfIn PDF document text
    • http://chengzechem.com/upload/files/16283135132.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fafalapevoleleluzumog.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/54075240107.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/butuzotipawagevesezojona.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/60576179078.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/81173913036.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/bakifadujol.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/29id1t5ljgj2tab2q258dqgj31/15004044836.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/49090385981.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139deaa8848a---43184178168.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/14286976419.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/84898204050.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/86492247864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=golf+iron+specsPDF 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_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 17016 bytes
SHA-256: d457a12cbe0b793d562a3f7509b17e97d9b51ea493526089fcc15d245f85f48b
font_02_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 10252 bytes
SHA-256: bc291a46b6441533c82d3eae485257dfa955afd89931111c237b44f6f22a5445

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