Malicious PDF — malware analysis report

Static analysis result for SHA-256 be53e79726e83f49…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 21:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd6f02533703fc95d142cd8b1a975afb SHA-1: 331a72d351d67d5d3cacf484cc6f03f51cfec7a2 SHA-256: be53e79726e83f49e1b64a72e538b2f576b9abda621d3f9e08a06b9c1867e865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610472687a335---76193205446.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee888d72eee---barila.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1b5c81d786d2579e54ad8c7a8fb8320f/pawisigo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3cf1bf140---5972519009.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/11330193532.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/dedozepefurelojenisupekuz.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wuwel.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430184919826075.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57e874057b0b4094fe5a72bc056fc0f8/jupobila.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/93484778086.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55322f6d9---lipufevanusedamepojavu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd26e9561b---75549779592.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9q1ggakj1ol1lufhnkeb6u6c6/67360622473.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/butisodugozis.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/midipadotug.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/43158043769.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/84333754986.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/271cf44142ebc0ec2fb73d1580ec97bf/dilidofa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f8f1f6f9---rikopira.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/lesujeligivonijiju.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1747dae0---xutifipuwapexolixazov.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/fudupakukidavixurubaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bryce+canyon+national+park+sunrise+pointPDF 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_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 18012 bytes
SHA-256: 6e4d38156531940328b0167baa6b8582918fd6a9415ccdc55e13f908ffb7d421
font_01_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 10724 bytes
SHA-256: a912edc324a512efb170890acd9631c3c4b8d0f972afdef7ad706b5db1a9daa4
font_02_sfnt_off0001427e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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