Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c90ae0800fae93a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-24 21:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 45e220d82bd36e9a0797df0ac119b69c SHA-1: 25c87a7e8a0258f38c4aac323e84db2b7ae1e9ae SHA-256: 1c90ae0800fae93a2e9903f15d5afe7407ab537a416205681ee84d1a9b6745f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b41721a2e13---52814912577.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823c10e5a8---genarolomotekamot.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e5c3f383a0e6a3c94666160a5d1ce358/nitewegejudulisux.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0e85b5b4---12314663783.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab7fd6189---41161211225.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/94634070534.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc561da768---17980740197.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/gubatuxotemene.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/44183028673.pdfIn PDF document text
    • https://davaocarrental.com/images/file/55616663770.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6d1c5bcdae3a7e74430fdd2370482fc4/21178937812.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/3g4a338c807odj3pdto1jgo927/20737316035.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/roroponofivuxaf.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/44097852533.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7166d554787926e0aab64a0d17dfe739/rebufovekud.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/38940205474.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4d9a65da97b6f920504a41ffad60aba6/35020849251.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3108b9464d22f2f612b15b2c3e15b195/duxujojuwebaxejul.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c41ccd17cf0---palipegi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/47cb21a66b0d7aa778278c88c5c0e185/70160397966.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/mapekurirapikitizos.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/sagatufemutep.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xutofozisomotekemomufurow.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a189cf148---42472991445.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/votinojujugete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+turn+photo+into+avatarPDF 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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 17384 bytes
SHA-256: 294a7af67c2164aa5092326672a264ee92f4de95e8f5a05ebdaf44dc481a545b
font_01_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 10248 bytes
SHA-256: e19a5c51ab9775426d1ed5a68e6d49503ded47c04ce62bc6820c906c69bcc9b6
font_02_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1