Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fbf0ea9fa2f5c2…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 19:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5ae369ce1a79fb2a01f810deb6e788d SHA-1: 02d4d9ea2669ccce2c68b3645613a806fc67aef5 SHA-256: e1fbf0ea9fa2f5c20edd367e62b5293b6551a9f5b7b2767963a891ff11cd0364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://alarrabnews.com/images/content/content/file/liseg.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160796b2c66c7d---51156108066.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6bfb9a5f3f5fa5130d0fff3c020797ee/63491143939.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f795da28b7---87736227301.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b365f1ac2ee---wuvitobi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rfdcqejhtgpro8tj1jfm3jkl90/purajemekevulugerutenekos.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11493e2b78---fosulidok.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f49273b855220e2a301afdec5c3cc313/14204776511.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00050f759---giviral.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/vazeselufuwerofadivamez.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hsqnarsso1ekeb9vvsn1dknlge/13290147823.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/51335301570.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/j2ieqkuog9aduvu4ms7l41q6oc/79362124161.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fa55334cdc19a145829f25625f0b6c52/46423171212.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/247626905.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f194ede1e93af33fcf55013409030985/mijadidipafotoxitijofa.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ddaebd61aa7793334069167feadd5f23/92196560470.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/11825790770.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c98ceafc6---87341113409.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dapobidaluxebog.pdfIn PDF document text
    • https://coevent.ru/upload/files/gawunenikerumikosage.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/de1824d670a956b5a1c33ec97e6eb829/18885258888.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9cf900d5---totemodekugug.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/55904341296.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/xudefujufalasejojomolalu.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/49122734003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=voiced+and+unvoiced+lettersPDF 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_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 19692 bytes
SHA-256: 8400b738be9cc8fd9fe9859d46714baf63053d1f3bd40d652da49991e6bd8471
font_01_sfnt_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 10500 bytes
SHA-256: 723be4754a8dd1ec9dfc3b6faf88a698aa59aad0e4942f85e41e8fe67501e773
font_02_sfnt_off000141e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1