Malicious PDF — malware analysis report

Static analysis result for SHA-256 92276277c7cd465e…

MALICIOUS

PDF

89.3 KB Created: 2021-08-07 17:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c8c089715d76de6e7f4be9db494f06a SHA-1: 7361934430ca053c69eb79d905291e3d544928ab SHA-256: 92276277c7cd465e071779aa70c6dbd23712ea2fd3216bb87729c096db08582d
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. It contains a link farm with multiple URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/66c41b5f0f5afc55f0b4f6e19ba71ee1/32002628572.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088535d018f0---mibajiruwo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/be72986df077c6b510be7f1f9f8e60c5/gazoxisolobi.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/borejisonedebikorapogisaf.pdfIn PDF document text
    • http://recviem.ru/img/upload/68671814834.pdfIn PDF document text
    • https://umartravel.com/files/59748376676.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/vimemanaxevu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/mapimofokatu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lirakusenasoneripata.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/si68l40mvo9e7bmqnnqfgcpcna/52771129389.pdfIn PDF document text
    • https://susta.vn/userfiles/file/41724422684.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/23488579614.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/gavujorimivofoxof.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/29096684355.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cd6cb2187c1d39100cfe493661daf100/pejobufozugoxubaripabu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09d50e94d---37257941688.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826ad55ddc4---nafaxegiwurisu.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/65254232384.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab8d99e32---10666697845.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a028209678cfa52f6ac2651f8f759e5f/jigawabibebelajexawemer.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/natovuje.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b4c203b28aac85926eb28ea43d437b06/43863680980.pdfIn PDF document text
    • https://hoalavender.net/upload/files/75607868133.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e304c04c---sadetemozexupepulopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kabhi+khushi+kabhie+gham+full+movie+download+pagalworld+filmyzillaPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb6b206ed1---jejud.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_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 11496 bytes
SHA-256: 3b5e6f7bb8a1fa811874363643e5934f07c11d0314bc733026ee4604d79c47ea
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 17360 bytes
SHA-256: 858b5866cf783af806d04c59ec9259571990fb1683a6dee0fa3ecc532089018e
font_02_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1