Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1709efcd73ab71…

MALICIOUS

PDF

90.5 KB Created: 2021-09-09 11:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2fcc49a3835cd2167dd0e121a4c10a0 SHA-1: 8c635e9d5f2c7c108df18cbf7d3e8297905e0893 SHA-256: cf1709efcd73ab719dc5ad62ab252e4d6511eebdb6a3acbb757ccf84d89f3262
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=price+history+apk PDF link annotation
    • http://www.galiantsolutions.com/emailimages/file/nokasizufanubu.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/95632081770.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/39963499428.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/55995591039.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210902195929.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65940188588.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a584767df---davuvuzubopex.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/37417157953.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/42070055877.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/83033853864.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/45849253906.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9ba55d9c---63122149650.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/vobugikidubolib.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/32467482852.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/woxiboserobopibo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090802281981.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161341ca9b2e4c---lomevawutamifuwituj.pdfIn PDF document text
    • https://tpk-m.ru/files/file/96812426424.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/wiwede.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/49921974896.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/83860626328.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/lolutawowirojibemesefa.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/10623871095.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135313672011---wanatovibako.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_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 18140 bytes
SHA-256: db1092f55dedc187b0dc99e4a8ea6c764f06505f1044e7b556a82a0e387ebc32
font_01_sfnt_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 10528 bytes
SHA-256: 6137b73bd05ba1df5c97e239474dc2b6476236f4dab973a7fae05784f86cf1b3
font_02_sfnt_off0001444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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