Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c35ea8cd58d82e3…

MALICIOUS

PDF

100.6 KB Created: 2021-07-05 13:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4f333442b95aefa08ce801ecdd78054 SHA-1: b88d058d409674088defeaddcb0311afd795581b SHA-256: 1c35ea8cd58d82e3ecfd7f8f437082fd2d473fdd0797776549acb51a880d709a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm on compromised or disposable hosting, with a high ML score and ClamAV detection confirming its malicious nature. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=my+country+men' and 'http://airconbank.com/upload/fckeditor/file/gezazexabefazoguzelipal.pdf', are indicative of phishing or malware distribution attempts. The document body was unreadable, but the heuristics strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=my+country+men PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/gezazexabefazoguzelipal.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/rewaxodesimos.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607198c2a3889---1376827689.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/5011602203.pdfIn PDF document text
    • https://coil.hk/upload/files/37947309470.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/lewikowe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8f0gbpato551ug5eh581i2k8ae/45135057526.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a24e7929e---movasonagibaxeroxexute.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kapiw.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73f221dc7---fivafizutovezonofonakoxo.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/zepalewafiwepizesosol.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba5593e49---10005803948.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3061fa83c9---sedimuxopu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6bfb01fcd60eb90bab23df4a80d08fd1/22751660027.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608671adae5f9---47387428490.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/bakidovoluxopimizoz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463717f519---71120575172.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/guvirofofiredazukiju.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/juviwewivesopufomu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6e7c3d9795105280043b7e8890cd6e0a/xitemarebeposokoxinatatej.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/67e8b97c39a22bac2fde14a801c3b722/60975599496.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/102a5747f5503c21df945fbce6f37c6e/junobotunufewafuxewoki.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_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 10132 bytes
SHA-256: 84c7341c91de6920ec14591991e4e3929c6d8e61475a39d9780b33fd64d145e1
font_01_sfnt_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EF 17576 bytes
SHA-256: a63342ed52fb258fe6446ac9d0a3e288f52cc3523083ae22d105fdca9ff7f287

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