Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7b43274d5288dd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 03:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65ed86cbff413a02a2a07e367350bbba SHA-1: c44004f30f7dfcfc8e668c6c024217027037ef06 SHA-256: 0a7b43274d5288dd8c09eb5abc0b1acf820dc9da7bbc11d5c786fae92f2e9b80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=google+play+store+insufficient+storage PDF link annotation
    • http://sevenseahotel.com/uploads/images/files/79921259796.pdfIn PDF document text
    • http://canoeing.by/pics/files/dalunuxuvugawasemas.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/nozonilawigunaba.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/54413258418.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/43233682001.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/38043989175.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lupumilapaw.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/zumugodepewobe.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916210542.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/bukubopo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145377bb9e10---pekezid.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/lasuvumanisoko.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/82033879294.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/2721946288.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/95527533715.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136619d04d81---79248701690.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/votopinuguj.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/25526456810.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143010242133---veparapexudepajizunasowu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd2edef235---xelozizelopaneforabavonos.pdfIn PDF document text
    • https://trexanh.net/upload/files/25578219952.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kijubivitik.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/jozake.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10908 bytes
SHA-256: bacef874a229b8c43ef03466dbc3c44bf1582c06526f965eecfc6cde65931202
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 18100 bytes
SHA-256: e83ade72a8e8f99eceb04e8c31d4f964eda2c70f068f0eb5b052683a5e782d11
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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