Malicious PDF — malware analysis report

Static analysis result for SHA-256 a698258a99bd607b…

MALICIOUS

PDF

94.4 KB Created: 2021-09-07 20:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10f3b830e572c7e6c66a2322fb446176 SHA-1: d1f27ab2076e52e41976841e1e159759d362ecba SHA-256: a698258a99bd607bbd5ae990dab2d05e11dd5d36926b5838d29479a510a2daf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://hyunbulsa.org/~ewedd2/userfiles/file/noxukafasitivesuvo.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/11778223276.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/61828833639.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ddac0f19096---nasosoja.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/838371370724a09820358b2a88b21edd/rujesebenuzo.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/51625838865.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf04f7d9b5a---nirofuzivuxututavibimux.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/70872025962.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/jivikopela.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/nowuma.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/896004071780e8c30fde707ce1fecf3f/82228815184.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5bb67a380dc68b0be444d74bfebf99bd/58517524936.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/99619690386.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/zumako.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e631211967f---69931282640.pdfIn PDF document text
    • http://tencanpowder.com/d/files/josaligokajeket.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060319584773499.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/83629147893.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e83dab65---82943950656.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/diguxexobekegitobatexas.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zenafa.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210617_163328_1612.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/suzonuvosununovazilomoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+global+citizenship+pdfPDF 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_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 11000 bytes
SHA-256: 07dd9a82768ebea721d28817a8905cc9eeb07bb64c93f1f28158ccc6d9d173c9
font_02_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 19616 bytes
SHA-256: a893b8039f0969a71c8839be99928bae783bc449edf720bf2d41ef025ddea21a

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