Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77d61273ba8d759…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 05:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b285a836bfb36c2d0e33c936bd4906a6 SHA-1: ffeb51960619ee9a574a7eccf7db3192fdfb3700 SHA-256: b77d61273ba8d759746d1b42a5153d0a71f8f36dba623651a1cf33535e8ebcf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://alsultantrading.ae/userfiles/files/guzojowawaxewosusi.pdf In PDF document text
    • http://perles-del-beya.com/userfiles/file/rurovavifagimixeredolusi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735cff1c3f---54966530917.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/gigimiderexaxatewezusid.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/lisitajozat.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/51768407151.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160726309d1c1a---22619763050.pdfIn PDF document text
    • http://svx.su/ffile/file/31891758069.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/11495104636.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/waxebezurot.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9ae7f73c5fd86703e146febac8d105a8/nusinozufeji.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/pilitanabekizofalatarikor.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/51766502937.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b7d52d30a828296efce0e7b033310211/mafufasuwufebukegajid.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ftkhsiqid4vjalb806153872r1/gilefa.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/vven788hkka8avo7gjfcc6doke/mupumenulik.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ecl4l1ltrfjqe0vm650ln3hj1c/10438324180.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ead7587c---43305896504.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877c02c41a9---2713798956.pdfIn PDF document text
    • https://penzion-palice.cz/content/19385099932.pdfIn PDF document text
    • http://intergeored.com/upload/File/77876370577.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9518f5f8a4---seworewamixu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f431a40f0---81112166884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=philip+deloria+playing+indianPDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16892 bytes
SHA-256: cb4778a612436c88c442817dc4e9ca2c28ffa1ed63cc3cff9335d18de31ad590
font_02_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 10520 bytes
SHA-256: eb930181c47923e531aae05e4b8bdaa89df77f6cd49a8dcccae72c9827154225

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