Malicious PDF — malware analysis report

Static analysis result for SHA-256 f001143e21c74c5e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 11:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c94d4ff2ddca0dc19019b6bd093bf0ca SHA-1: b5b3ffe83646c4ccef58f457f814bdbf2fd3d764 SHA-256: f001143e21c74c5e531e780def7b1ae76dfb524c4edc744340d17c2092ebd999
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. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=equations+worksheets+7th+grade PDF link annotation
    • http://findusafranchise.com/files/files/33637543756.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/99567725201.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a363c2b4a6f---14117701056.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/90aba127b7f64192d1eff5d4fe73628c/2387916123.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/89292550228.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/7057436739.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/pojewug.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c9562fee732ff22892b3ab77f9207cc9/zipane.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/23114144393.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608339277ebc0---laboromivowitan.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/gibubifizow.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/zegavevekuzipivoxosaluri.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9262bb7bc38a2f7e266850ad25364e98/43135278997.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210822082101.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/96841929399.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/30861594335.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f197346395---rajomidavuser.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/71663955396.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/nanojufe.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/bejabipedep.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/38d74672d79df06efce94a573442a7d1/roxukanorexatavutubewa.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/kebugelogaw.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/11498432140.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/73684593389.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1928540f98e59754b884740e6514fb8c/88283588042.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/56742493402.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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 18560 bytes
SHA-256: 4585ae3f278328cefcf503cfb40028d67c5b8012c9d87ae44ad7edd8bc575b47
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10936 bytes
SHA-256: 29166b2253a5a52899a039c946501620f45008650cb673227aadfdde3b989af9
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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