Malicious PDF — malware analysis report

Static analysis result for SHA-256 df99caa10d1748cd…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 03:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6c7204eb6810ecd2abbcec148310cd8a SHA-1: be339817fad79d27642270a3be45a2bd8355bccb SHA-256: df99caa10d1748cd0e42f3c931b68c33aa5ddfe899ffba042accd7edc1a01547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=what+if+scenario+analysis+excel PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/39c543b90ae995bd1cf8015d66e7c3f3/rekiwanujagugibab.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/pesokili.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bdc614866---panikevenoxibowovajegozuw.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609644a3de9c4---xaxutaviwexikawukomivojim.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/vikawigegereno.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/karapujafalozomam.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9765c5f7ce---46466735601.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/00a61c11163cbca0ef2b9d0da1b52da6/suxelejudasazodutilizu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7c408994---44496381521.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa991ae2f7---2815123031.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41666ab1d---27678273386.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/59100818440.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zurizax.pdfIn PDF document text
    • http://valeneighbors.com/userimages/84104929333.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/40457787802.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tvfnkrlum3dpeda2r82v5qvkul/23995571243.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/wapika.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9e4a8b99f41cb50ab93260cb3fe35efc/36289260123.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-3/20210703161712361829.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/87659895966.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0e090cf5c40529c161b99ffc951c216f/80469110986.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/96b75f6d75c1f966ff7a2db60cbad674/diges.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1bb115e65a2dde29ed485141afdbc646/baferitalafutobupef.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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10640 bytes
SHA-256: 671ab7ccf0ce01bcd28d8d5c5621158bae29e3adac10db57d99262cd62875243
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 17964 bytes
SHA-256: 2f04478b0746969895b4a21428eebd9ab54546866815572eaed0d57612aec8d8

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