Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a2cc4682ddc802…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 19:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf3edfaaa2fafa68a11f13da55730e76 SHA-1: e34441b28be577c224105e0a46ef5db72bf71ae5 SHA-256: 72a2cc4682ddc8024c52ed7b21136f155a8173e703f01813bbbae938ca069644
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=lois+tyson+critical+theory+today PDF link annotation
    • http://www.cbs-emballages.com/upload/file/43194029438.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sezusovu.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/sivekurotuva.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/21773286617.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/95732404558.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210902_083756.pdfPDF link annotation
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/fomiletizibufajanagovuz.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55213232726.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/41548642814.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/mifixuxifinuzago.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/38231107464.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/pizatofeverigep.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/66599997475.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/99423873067.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/77621015267.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c59165a3f1a3545f02b246ce2c6d2961/98572911625.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59e5a763---faxuzofuvadasinemigali.pdfIn PDF document text
    • https://simorgh.it/uploads/file/tusage.pdfIn PDF document text
    • https://coevent.ru/upload/files/fagopunixofaduwufo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccec852cd7---tomomeneraridajojupajo.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/72089588282.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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 17636 bytes
SHA-256: 66b6cad916037515b9c555c37338ef1ac32365421ecab077e3c206b8434fd310
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 10540 bytes
SHA-256: 8e23451b7cc5c58256b53fdff67260ddc83e9a715a624870f3ab6e78d8b995fa

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