Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa2cf8d256dc260…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 18:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7317090ca6c04ef77cfec553b7f1fd04 SHA-1: be6430d02ad1a165c22f0fa2356007b13cd6d2fd SHA-256: 3fa2cf8d256dc260d90fa48200ed006ab10eb91db024ef2d3af824ab5845ef0c
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 WordPress sites and disposable domains, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

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://krisoc.ru/uplcv?utm_term=largest+jellyfish+ever PDF link annotation
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9aa9f485ed67829e8f087495ba82f7fd/999092673.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/45ee73db2a8722aba4490db1ef28c012/19183210021.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9178a079dd---67472314640.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4b7c3130851882d3cf2c0f6766cafa6a/27182517764.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nujupijeberugikimikikes.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dfcb1b350df3dc04eb13eb64d3645a6e/39592043505.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160704836adda7---nopekabuxizuguna.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10c67b578---saxafaxumevezexi.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/58232703059.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/88690059689.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/38370332882.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/zisetikibilolafafebetelug.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca5d186c9---fidixelopekib.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38a6eab92---noparimofegevabovo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5bb6271d5e5f372951ce15686f60873b/wipikunibafu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e8d63034---wejixulejuliwagu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d476a992---negutetakimekawifub.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ef8a868d---govukak.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d7073677---93814430099.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/795ea307a42d997f74db9f79228be38c/59146897042.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/66927432449.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/22e65d8bf7c8ba21ee966568698b427d/12552217716.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/76163349516.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3c5e4abf---93046704986.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_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10536 bytes
SHA-256: eef02835373d8da911ceed14f14dd0bed68ae51ac962372aa941039e13225862
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 17448 bytes
SHA-256: 2840a8337386ed4308b1f60f4c10e87f84fcf27caf9e54cd05a96f032c68dcd6
font_02_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.