Malicious PDF — malware analysis report

Static analysis result for SHA-256 558a2b2f0ee31820…

MALICIOUS

PDF

68.1 KB Created: 2021-07-28 08:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c772d8869cc4bffe643914e5a81b4791 SHA-1: 26968d390a676e29812fcfb640ac0289e28c4581 SHA-256: 558a2b2f0ee318205528adf9cc11ba610fa069ff734ad0fd1c31de779088366a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7971

Heuristics 5

  • 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
  • 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://amadpich.com/userfiles/file/77016815173.pdf In PDF document text
    • https://uniontend.com/userfiles/files/pegenuvukapuweti.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e42a3eba4---47412394035.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/1554437663.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/qtogq2c386dr7bm3f03ogn77e7/81501457087.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wigopepawixax.pdfIn PDF document text
    • http://jarosi.hu/files/file/pigefes.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851a360c27a---43185985671.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9936b67424---vororanetoxep.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kizivuwesazobefa.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/92020784640.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021430178159394.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbcde7349---50115024121.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091680b99e31---fedipixagilunagamebe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3a33264d---metatoforotukoxunezoxibof.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/wusin.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/wikosapezuzaf.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/22e5a62cc5d48e4e188f8fb6e9465e94/vuzufise.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1492830dd---56818451060.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1qajd29h27rlqfpu2diod4s7r5/nexoputabiku.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/59714767532.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094396f40555---neforizedezoziveroxaxubo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2j8r2p6769b2ci82212skq8fdh/xoroxezelobafejomataxu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/90524444669.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607310a0d6463---18685119152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adding+and+subtracting+integers+guided+notes+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10972 bytes
SHA-256: d772c9108d28998681c548eacdbda29974f88203a4464a037c257d4b589eca29
font_01_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1