Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2183bc46ebb1f47…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 05:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76e0c68a0a09842882a841b19ddf2a9b SHA-1: 4218f9c5ba3916c2442b911dda3cc8f4514c51e7 SHA-256: b2183bc46ebb1f4740b32d786906790ae3898c717cb8218c3266daee0e6a24f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pogservice.ru/userfiles/file/tududefegowubanoden.pdf In PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/49313757170.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/morurujafikipim.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/pupexexibituzisolobo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f26f5ef---dizanifamuwapizavil.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/16016166982.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c56c2ad---69419477790.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vetol.pdfIn PDF document text
    • http://vejwun.cz/images/kanamuniresejipibaladop.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e7761505---jufiwebuka.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a076fe826ee---kukutokamosin.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fexibedunidasoriwediva.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a35b17ed43b35a8de49d7902661cda74/97098398938.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/fomosed.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3a5b1d2af1515c55c87d6cc63101ffe8/lubamo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/626875287e14b076d55f7374204ec4d6/dulibuwewinadorama.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/wujuxikabifovopo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rf2fernrtucou9nudfmoj5mgd6/81224814875.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zawetanef.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ce83a7544b837fe7a16de4a51a23e375/88215646876.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9cc9512b430273a07231660f79ce3dc0/77057865823.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/32177067631.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/38282822977.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/73995055582.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/kugifubexemizodizonelupel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=percent+mixture+problems+worksheetPDF 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_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 11000 bytes
SHA-256: 58ade6caaa2f218865856e77d866748fe63e3e3c56ddc4b275464922f9416620
font_02_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 17152 bytes
SHA-256: 3aa309e01f40b43f843e0ce5770d410010ed0fde5d8b5521b13eb47661bf8bde