Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8213be50c968b8e…

MALICIOUS

PDF

92.7 KB Created: 2021-09-15 19:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afa345499c5c82595d58c82dbd746019 SHA-1: ff0e672022e1e4823bc88df4124ea9ec0c200bf9 SHA-256: a8213be50c968b8ee389bacb30e972dc7587e4d29d70d8d0daa79bfeadba18fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://imobiliariaimperio.com/files/files/bebutor.pdf In PDF document text
    • http://beijingteye.com/upload/files/24381539787.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/53857632322.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/99803501043.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/34438573.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/54668357745.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/70996457394.pdfIn PDF document text
    • http://industrialdevices.in/uploads/gitepilukodazi.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/vufasuwam.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e54294c2b---sumufufub.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/98721806673.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zudexotobijizodilaj.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/luwifafusobojapigigodorix.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/xobewemanujagow.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/85708344712.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7mhq1jcl0180jbodjseaolptk7/xutiposaxoxu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gue3rfe91gnrr6le0r20r1rfre/81917438414.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/neganovidaluba.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/perununi.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/85471683665.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca1031c3fa011e314fa77cab4417e088/budadekaxisez.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/68357728413.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/357652582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=real+football+manager+androidPDF link annotation
    • 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_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 19136 bytes
SHA-256: cab8ec2a02ea8d3bcf9e4aa3d47e7ccc93b667e602b6616227ae72428bb3082d
font_01_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFC 10716 bytes
SHA-256: 313954dd7902a90c04c0a7101a70cf0a70a6dd53f7d2ac39ca5fbd041e643736

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