Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc7838d79fd50d5…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 23:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a752523474260e904a359f341a4d71fc SHA-1: e09a381460af063be4560130488e5b9c54667f05 SHA-256: ddc7838d79fd50d5af3aee8d62f56820428342d64a301c1e48906fa5b6c05c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=james+hadley+chase+books+pdf PDF link annotation
    • http://chochosanencino.com/uploads/files/56602285625.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/putexozarivagozopumor.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/buxopoxavarejo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/ratoz.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/vegupenidirumisuna.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48556618515.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7d09e21b---kekelikig.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/72908268401.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/pobufilovurupuzigokil.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/36296233764.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1c523b722f2add9ef1ba78ad4218488e/zejonu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935780ba56---tukobupifamizukelagumevuj.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/madikazilovo.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/12107659800.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/relizusatu.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/6552494832.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t2hgtj8jc427svlfiieuavsrs6/weneworowukufu.pdfIn PDF document text
    • http://alltechsro.cz/files/kopolusoduxumexo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec43387425---kilekejobogikasijuferemi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c4004106---teguso.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d8ed1538229c4b70a8b114312ef2fa42/dijafobakaxegumisewukose.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wofivezajokirevezorunox.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/npl0vld6ehdsmap2p0a3lkguq3/soretatonaxezomenidin.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_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 21424 bytes
SHA-256: 932e193982029ba0e7b741ca0e088a632ac9bd6aec442c2ebadb38ad25df920c
font_01_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C72 10828 bytes
SHA-256: d68e8cb01bc40d5ef0ff3d50b483002684289c7c489fca701e1b8300643f8b8d

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