Malicious PDF — malware analysis report

Static analysis result for SHA-256 9007301e6738dbe0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-03 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e59b68c43ebdd9bfbfbd8b0c9e4be75 SHA-1: 58d0133eaf3c2c02cd7e780466939177fde761d5 SHA-256: 9007301e6738dbe00b4974a50806c829de1de13d4898963b9f8521f1bd6c44bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=definition+of+charismatic+leadership+pdf PDF link annotation
    • https://kimtuong.vn/isc/public/files/fckupload/file/salowusilarobusujuwagemu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/dokuvobuxapodipo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-23/20210623033636252908.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/28023071844.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/sukanolutaxogoluvoxusij.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f598f532e7---56092050698.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40631331255.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608360ffd1ea8---98098356773.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/67445840012.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9e1ed89a---ramisoxu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210729215854.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vujorisuxowa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5r578vlg98ptc0ss8d03krk60t/fusuxu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4613ccbfc---4375775885.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/7626579975.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fuzuxukuwixasumem.pdfIn PDF document text
    • http://ahchala.com/img/file/pepasamagino.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/63243149953.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/95721657724.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0b227a7b---3724326435.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa7c5f86d---49132206538.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/devizetonexuginowutumulup.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_off0000b417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB417 10888 bytes
SHA-256: db5c91a8c94179d8071afdcb333a6aaac687b5594aa5522a25e878f26296368e
font_01_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 14520 bytes
SHA-256: 5562654fdd0bb486741ece8573b493918cc42b4c85c4256d2295fb003e35c0b7

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