Malicious PDF — malware analysis report

Static analysis result for SHA-256 7683834bcad3fd2a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 10:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf84508291327d0df12eec1bbaf9b3d9 SHA-1: 56c014f3d5b569079b8a5e924cc7a1ba6e3a725e SHA-256: 7683834bcad3fd2a257965c556e1da68ee561604d439717e87d085e2d25c7779
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8debd7326859afe5c1d72564b597cc57/32886650713.pdf In PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/18838704182.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/8aa6fcccb6f72546bc8a8f8ef12a683c/kururaduxibe.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/xujuxukaxa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d70032f1---11628913535.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/17754838640.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/17264223288.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/pelowozekewoxatutopovow.pdfIn PDF document text
    • http://kelvista.lt/images/files/59412117977.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/pedulosudosabizi.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/64023698976.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t41dijnpapnj7bh9k4mqv1a2mi/2077139017.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ogth3hfvhhikee2ocspv9hdq0t/42198913405.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/40182303728.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077783f07df8---25877733015.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/38664345795.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wabor.pdfIn PDF document text
    • https://umartravel.com/files/96114841501.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/802893403907c97dd25081db44199a40/35649492828.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/26092f691025f621cd366ba6494a4d28/sorabob.pdfIn PDF document text
    • https://digireg.cz/upload/94034713369.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/relagogag.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fubeturomodagejet.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/pefuxuguzamuwix.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210827073031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gigaset+a125+phone+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb32e01a1---tutumotafexow.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_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 19504 bytes
SHA-256: 6071858a1dd5baab7cd30958338b10cfdfbec96fa6db1d164d537d11a291e29d
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 11044 bytes
SHA-256: 4a0b533856ef866cb88c0a86ba43428ddec3248ea8fd74fe6a824b3a3b44b86c

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