Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da331b3576bc4d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 17:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77016110ef4e0732be035c19df91f909 SHA-1: e20375a55a908d71ce63db8cecbcb7fc01488dbb SHA-256: 11da331b3576bc4d30e299deb5978553abe5d91b5a6ff659bf35b652cd000855
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.enredmail.com/templates/files/idCliente_/file/jowekikef.pdf In PDF document text
    • https://padservhosting.com/userfiles/file/janatasamoxebapofemim.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/belameko.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/xipudunabaveginobomumur.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/forevuv.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131633dc7e05---82901471222.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/diwokorowukudukil.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/19929325563.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/74524618429.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/muxenezojanutadekogajog.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/10041598449.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wivifugukaxagumik.pdfIn PDF document text
    • https://peterdegendt.be/file/bowumabedozonido.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091a741c8c---13170574129.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/39263573645.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/45169710971.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/goporate.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/21016941827.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/33149494651.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/punatozifujaririror.pdfIn PDF document text
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e31c21efb455ac0e35153ccf43c92a8e/4054452837.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/97986825552.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/93174500957.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/34839406500.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/lavelowubakusegos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=real+car+parking+2+hack+mod+apk+downloadPDF 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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 18780 bytes
SHA-256: 99205adfd732a4c9f39bafb91801024bcff099d32a050be80a37215282e327ce
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 11036 bytes
SHA-256: 5546bdb9284c5311ec74adf93c973248ccbca6caf9eacf60a73177da2e460043
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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