Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a8bb5b15c11f30…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 20:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8ce239495d5fa95d90dffb2111001e2 SHA-1: d9d6155d523be2e579f88cf825eba5e1d6f030ec SHA-256: 09a8bb5b15c11f3092cab040bbde971219c3d748bcb5391f73a0fe97d2940936
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or are hosted on disposable domains, forming a link farm. The embedded JavaScript and the nature of the links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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://wolfgang-photography.com/userfiles/files/25323638936.pdf In PDF document text
    • http://rideco.hu/upload/file/42712103250.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/pavezosabozetoxala.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/rejowisafuwijefuromod.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/nadusedu.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/59263786251.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/dizomenomuvawativos.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/71372753724.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zafojiganeveguruzuviri.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qui359bbq6ijee83d1v146cc6o/tibakizavokasuzow.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/86822031357.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/q22ir0almvembtsbrlkafhhn4b/mopatuvonam.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2bab188c2813f72399460b26ad31f100/31686525121.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada058c1b7---82417196912.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///nitabedulogo.pdfIn PDF document text
    • http://jcpingie.be/public/files/nujaxebogugowawimitegad.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1737c5007---81169518057.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/niwujepixomaxikuloga.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096b766454c7---98569148298.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a23db4ab---27967718792.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/o3vi11dnb202shoci2hcl2kqmi/1491945753.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/55222634384.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5ppeubqcvo5b77rbo5f36o0bv1/31652287556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bhagavad+gita+in+sanskrit+with+meaning+in+english+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 21156 bytes
SHA-256: 8f78e46ccbb2400ab4241a2385e28afef0c9b1b293737afb30abe59e05e5ad86
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 11124 bytes
SHA-256: fae3bfab0ad4291663ad2612be48a23aef89c2d36d4b95adad6b90b60115931c
font_03_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.