Malicious PDF — malware analysis report

Static analysis result for SHA-256 248de87944c0523f…

MALICIOUS

PDF

90.4 KB Created: 2021-08-05 23:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b235b52c7d4618d8aeb70dfbe7bbfc69 SHA-1: 10f04562a55122fea9b89cd88e70866aba7cd714 SHA-256: 248de87944c0523f0721515d2df8f0b3fedede27ce1d7a29982cca5fdafe2c5c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3c0078afeb04b94a802c23a05ae92968/88257081367.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kfo6rcntsjcptmrgvt95rd0dbr/difogejodilodilimurovope.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/76424094379.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075386326d2d---92787932472.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235255a09a---34522149087.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8a987c6b---13131399863.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8uks9pkc0pkrms2fnkjgm2iu48/51080886128.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/bibatonisoj.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/11552863721.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/jukem.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210721181904.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/66b419d998f0d32855cdfeb6acb9ddd3/5586928723.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dc2c5db427b905c453d544ac7be82cff/2926738706.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34695177114.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced89b8530---33223512445.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/xavexadonuzawiz.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b37e69df6---48124422078.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/forulibakumegate.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b0b29eb2---57105630340.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070953da9960---72968414224.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5dd189e8f23579f4cda50ba74b1a1d7f/34520318575.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/531ff6f190f0151e6b9ec7b3ef42a9ee/59967545068.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e7f26f99656e83eaa9f8fa80161eb58/xegowelu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dcd802817bca3b4c8fa26805b6e205e7/83426743285.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/40381660019.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28dae2188f681c2f9cc14fd4715f7be0/zarafamubipejamamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=comp+xm+tipsPDF 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_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10004 bytes
SHA-256: dad549345fb216e1671852ea41e60072568e6bacaaaca45dca39e955e8d800ee
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 17708 bytes
SHA-256: 447e7fa3d00ee38d45b84262ab10b8ab22a6398a78e7e59b84a7ae60289504f0
font_02_sfnt_off00014275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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