Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1c9ef0ce143105…

MALICIOUS

PDF

93.4 KB Created: 2021-09-08 02:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0debdf84282e6643e0e4b93b220d86b9 SHA-1: bad727f20e125ef1138de388e88b55c34a570f53 SHA-256: dc1c9ef0ce14310549219acb800820bd2b4bb87f453a5ef4f22726ab451f40b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of a download button lure further reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cuatro-pr.org/sites/default/files/file/butivurudexi.pdf In PDF document text
    • http://group-anons.ru/userfiles/files/47948895235.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7b0d4b5f---92365277121.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u324ee3spnlrfh24s5omlqsh8h/jobarigisanokedizevosif.pdfIn PDF document text
    • http://3q1p.com/upload/file/210608110211515627l9lyasxa0rou.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/13381407590.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/25493344777.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9fefcf3b9db58e290ce52d6990269a29/4311545555.pdfIn PDF document text
    • https://hirurgija.me//files/55975553267.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9943f1367---42632776380.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/81692375229.pdfIn PDF document text
    • http://canoeing.by/pics/files/vajunesobe.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/20456353128.pdfIn PDF document text
    • http://change-sexy.com/files/files/metiladuki.pdfIn PDF document text
    • http://xsteelstock.com/d/files/69296861963.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b86b52a2b2e18009e93a39c7f04786c2/golunaxibufotona.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/dezuxamilawibitameluf.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/69d5b1a21ac0f1803f79f256aa90ddde/xowozamapovutij.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/razokeji.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4tqkeu1biuipbjk41rpfrrr7l4/wobokidanitotobijimug.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/25308056916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=police+complaint+letter+format+in+marathi+language+pdfPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 20512 bytes
SHA-256: 56af61c4fdf3b00ecc180ed5e7dd0bc85786a5e64c191ae32a057af8c5534559
font_02_sfnt_off00014e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E98 11000 bytes
SHA-256: 646cf74f377005949bfa5bdeb36f5bf20b6669989c989568e608bfceb9aa7a92

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