Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89ea9904bc6902e…

MALICIOUS

PDF

88.9 KB Created: 2021-08-19 12:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c796ec2e039f8a3394d9446fbd35f8c9 SHA-1: 7f8c64d820dbf08dbb9f6fbccc6a102e21e6c7a0 SHA-256: a89ea9904bc6902e9a8199dd44095056a49fd6485cb96b17156aef0277fade8d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads and disposable hosting, suggests it is designed to lure users to malicious content or download further payloads. The primary malicious URL identified is http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jtnn6knj7ola699002brlbi1l3/vegamolodunimevamopovap.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=human+physiology+an+integrated+approach+7th+edition PDF link annotation
    • https://btegypt.comfile/sinugo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/24agr9hj6gdeh2uev1pdab29i9/95726540044.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7vqu3eed4t2qnt9t68gctb7ed1/93657251544.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ec5fd3d4d9b4c63a39ca1c85224e6632/90437177640.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tuguzimeditetivusovubuv.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xigepigujiz.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vosixonalumit.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jtnn6knj7ola699002brlbi1l3/vegamolodunimevamopovap.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0a8529ad---bomajetugaverexudoke.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e0e5b9c644402abbfffeceb38ab9fc38/78221644289.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/1152629764.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985360288ec---15203866100.pdfIn PDF document text
    • http://didopack.com/files/65088894599.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pipuxusek.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/fexeko.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/simibuzetiwuzenakafuv.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c2a4d63934a1a73583460a2191bb3627/panokoninijoguwad.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/wutetakawawi.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/71952642625.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7adad178---25470307402.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85a071f92---xojuzib.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/gusapa.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ja38auv5fou819lebd20jo027v/direjo.pdfIn PDF document text
    • 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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 11216 bytes
SHA-256: cfe1c4dcddf89b2729d5c33f4c83a444f9854b9e2f9adca0659a886022ae7084
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 17424 bytes
SHA-256: 2fcbfe822dd0e2c1c786720c21906ed1ae4fb54778d30fc48caa863895515187
font_02_sfnt_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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