Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db44b454d3c1eea…

MALICIOUS

PDF

139.2 KB Created: 2021-07-08 03:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b08cad4ae415ca610ebbd3b7d2a75ad SHA-1: 74e625d33b6c2ea20745a6012b0d222e63d11d7a SHA-256: 2db44b454d3c1eeabcae6f21d023bb0281f7da1f794b498848daaf760fce95c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit user trust by appearing as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://smidgel.ru/uplcv?utm_term=free+plays+for+middle+school PDF link annotation
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9tqcb393ic245nl16a66oegrvg/52474250002.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/72128996246.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/559f0215c76228ac785c2963b647dad0/jodizidufezapenabade.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2331c80f0d99c81aae50546cae3f5274/20835636386.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2p05vd9htfpqprnblsj6f9dfv4/68358069314.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/92680778081.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad35459f98---boduxolunuwilozipi.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/winokulifugekiboke.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a455802a480---91277186464.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb41abe91b---bejoparevedomage.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/22326d6528d5484be87579f264d30719/88755273643.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/da283dd52f5955f9e4a7fa3a57c11e4b/fejinokitovuro.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928d27039ab---93967337751.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/296a5586958f25c00be0e14cfbc9eb5c/xewororuxaz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4s3urqqngn31k7ekdjskfj0ccr/tukapejirowosaxib.pdfIn PDF document text
    • http://sam-global.info/files/file/36904432469.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa507de53a---50640455928.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/soderugitusulerukinerabat.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qod5dkmssc2rslh1mnm1oj1haf/55997208074.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/bd1e640b14fa483d809ce39d7a636856/zesuroramusabibimeva.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16071adf86e13e---54357334324.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/654c8c2209cefe9c64e3ecb63aabaab0/vetemam.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0c0d49d33668dfadb27c79f69ae93ee7/77444114171.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/8544374955.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_off0001bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6E9 10772 bytes
SHA-256: 2ce7ee1441224fbdc5204025c7285eadbcf6a0a9c4a599f7ef0a1afef0d64a85
font_02_sfnt_off0001efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFA8 18088 bytes
SHA-256: 8827a0482c21261b92c8ee49ae24040e10cb0432eebb6f2e422bf0cf58012369

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