Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ad7668e076a9fa…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 09:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3dc040b385f75c00c2b07efa53d8e3f1 SHA-1: 9428f791ef1106b3b490223e79c14e22109a62eb SHA-256: a1ad7668e076a9fa1cd2563d030d1e83a428dccd0026cb70ee05cc1b6c2eb6ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malicious redirection attempt. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or abuse multi-factor authentication. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+download+data+from+google+drive+in+android PDF link annotation
    • http://jatechkj.pl/upload/fck/file/tojewaduketadofome.pdfIn PDF document text
    • http://secretinvitation.net/images/files/dexujaze.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939145feb4---93201061475.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6f047befe8c0a50f1f786c4bdcd1273e/47125194433.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///madazidirosedalavisefas.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210906230106_zux120.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/26287756112.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/zumunufezufutesizunodesi.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/poxotuveteximede.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/17981881952.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kuxitakexoj.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/nifasasuk.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/ruruvozobozelevefak.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tozejenoluguzaroz.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/50010926427.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/32967722910.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/bujorowitegi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/65a089ea90e6181d0bb646823753dc55/84801354019.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/89081832273.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/dedepokuzinovine.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/96201440515.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/54224414522.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/saxapamaxomafovubew.pdfIn PDF document text
    • http://www.bash.cl/media/file/47210666352.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_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10672 bytes
SHA-256: d18e96146c72654f2a73b515cb17e2b0c53f9e23e3e26dc2dcedcd8ce8fe9c8b
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 18084 bytes
SHA-256: 2e21ab8f318027dd044c4d96c790faa96caa81a16f4e605461c82b8e1b38418e

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