Malicious PDF — malware analysis report

Static analysis result for SHA-256 521fcf64849c8901…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 14:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa3bf3a33c2f3ab45d5e807b7dc6cb98 SHA-1: 7687ca7280cf06fab773b6f7b5e0fad6260f69c2 SHA-256: 521fcf64849c8901cc5c36ddab25817a09e88ba8a27693a5a830a68035f79d99
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDF files, many hosted on compromised CMS platforms or disposable domains. The heuristic firings indicate a link farm designed to redirect users to potentially malicious content, aligning with phishing and malware distribution tactics. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=top+10+coolest+apps+for+android PDF link annotation
    • https://organicfertilizerproduction.com/d/files/rowejibegedabugumofiv.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/47343328546.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/34252317746.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc57241c80---rofomi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57rnc7nrgl0n91jhpvg3jgj0hq/3269319077.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916135436.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b91c20661---xasowunowipoxigewox.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/7561391409.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/bokixibejasunikaropo.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/1558495748.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/guxareloxonuvomeba.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/58e62c35958514310a83cbd1760a2753/kevitopukofojuxen.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/lugegotazunidar.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fccfdc9db---xojilukunisa.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/80701838165.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/potopujop.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210908222322972113546w6.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nazirinobupibejedatoga.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zatatu.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/62889345443.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/50ebfc4b39920dc6e1f2254d0fc36801/kolet.pdfIn PDF document text
    • http://iwort.de/userfiles/file/finitavifutara.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_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 18804 bytes
SHA-256: b6cb96f229025f60515b50a69cef818bae99ac384f10104596b58f493490fb98
font_02_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 10752 bytes
SHA-256: 62b6980b6112486d59d39c315e8094420fe208447ba638a82ec4c8acffa0bd58

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