Malicious PDF — malware analysis report

Static analysis result for SHA-256 452cde3c544ca12c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 00:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff544d4f10a5b0dd2d90df73b21fffa6 SHA-1: 1867499ba5b1d37f48aa1f001276d73d32e45abd SHA-256: 452cde3c544ca12cd92adbb443904e8d05b7931f749af90a571f119cd9d34a42
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm and compromised hosting is sufficient evidence for a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=gta+5+mobile+verification+apk PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12526556649.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ee751c79---26690761757.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/59398389861.pdfIn PDF document text
    • http://unseretochter.com/images/file/26090886796.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/ridofipiribugunulakew.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/35685178638.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/devopas.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0e94ebbb---kabow.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091808132973499.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/67859311664.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/66937435688.pdfIn PDF document text
    • https://pellevah.com/upload/files/wuxoguvig.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0f269f2f17efb0190d7b0ab9de2eeb76/90938308130.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/sikujakakura.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/dufas.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vakuwemaz.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137075ca12f7---20633214885.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jedudaduju.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36c228edc---wenojisuposazejiseratom.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/84126885569.pdfIn PDF document text
    • https://matricula.arendic.cl/files/29284288897.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/70912161023.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/27490005085.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/36032324896.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 10944 bytes
SHA-256: b1501ca1fce8a09334982da38c095ca1ee8d26fad2bf65f52838451a35c1489d
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 18112 bytes
SHA-256: 47648d7abecc72e572009f9c6d4badbd43aae87cdc06f07d12d68fd58f9bd2a4

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