Malicious PDF — malware analysis report

Static analysis result for SHA-256 e901d85e48a3456d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-15 17:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: adf96c89bf432aa0e31526c40c20034e SHA-1: de115f9bf6100a0bf4d471df626a536c8617198b SHA-256: e901d85e48a3456d83a428160758bef6bbb431ee23f6b9c332ee6ab828428eda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the presence of a link farm on compromised WordPress sites, with multiple distinct hosts and URLs pointing to PDF files. While no executable scripts were extracted, the structure suggests an attempt to lure users through a document that ultimately leads to malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e4da9b26efd093c67ce2cf044d91eca9/74410922398.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/aca4684f93cb223dbe36c10dc8f97c30/nuziwumajozesukorevujugu.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/ziwufazefotazusidorunef.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/20356271457.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/90v6ij6u6kd8f37eelv6smrq36/73438998107.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846369c8d56---tuzufujalamilu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/majamedab.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cb3a96e198---xupubiminalojizanep.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad594d2b4---53314178830.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0ecdef0d7---raburetijo.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zopokadaneruvopakobi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/622f3cde1fb46f4b50c0836e820c1cbd/poluwagokuvepubuzel.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5bfb145ac---mixobojosusuzij.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/20667984457.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zuregisitixixevelib.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/52127696245.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e38f9e7bdffaf072fa17a8163f2a06d7/fafem.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sunumakoxasugevamal.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/86167990510.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tt44lnneh34g4fh8qqqrbjde0q/87264074439.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7c7f1f1a6c0efd05a9882c61cb6cc1a9/zimunesegejajajokajuzose.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b3a34eb7---zelusotorilareloke.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/43483232145.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/67170670640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stress+induced+nosebleedPDF 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_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 16908 bytes
SHA-256: 6d658010e0cc4112da6b536ed1a4c2223673586676af6a7f207033c53b7b9d25
font_01_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 10516 bytes
SHA-256: e874e79656e198d577f747ca3ab7ce9ca8dab56b01a8c0c168a6781773e9d970