Malicious PDF — malware analysis report

Static analysis result for SHA-256 4440526068d2934a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 03:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33d3bfdaa6432d5108c6c59d1c8d1f2d SHA-1: 968b65b8c4c1709a25f6ee653fda8970e7047dc6 SHA-256: 4440526068d2934acf7b24bc6182078f2d2161bb79a2685ec3eca84eb4588864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=minecraft+pe+1.14+20.1+apk+download PDF link annotation
    • http://sintjorisparochie.nl/userfiles/file/80564331219.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2851a61f0044dde974cde8f9bd094da6/7361807877.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26953679867.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/21291781498.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/34960827873.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161303d51e34cb---limejuf.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/zevemujepageboxenizetiru.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vofefinidadevibikuguzem.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613132f339b50---girujuzufojek.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35767742068.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/polefu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/59890644357.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/6349519179.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/65820157624.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/80ca1e4a5aa01966891f11e2be0eec15/letememudupeme.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/fesavebofaxulojorolitu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/42287132151.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5fb2d76e45a8be3175bd0f9cc14ac39c/84806852014.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/79777336083.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210901203415_lwgsyf.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///29436406637.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/defoverul.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/33739794629.pdfIn PDF document text
    • http://geodez.com/pliki/file/nesoragupij.pdfIn PDF document text
    • http://4rrecycle.com/files/file/98636357583.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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 11056 bytes
SHA-256: 0097355185381e916300a2fc69a4cdf0df48e200eae4ef80d8b3bf9c0cb5636a
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16676 bytes
SHA-256: b6b5e85cb72c75fce5e2d45fe153233d0fe911f0fc5f2cbea17a2e18d5e0ae48
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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