Malicious PDF — malware analysis report

Static analysis result for SHA-256 609bf3e1ab497cf7…

MALICIOUS

PDF

107.6 KB Created: 2021-09-18 01:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: debda94b8dbda0cf59e508012770ea08 SHA-1: 7409de8429b5ef7820c73b1c77b97cc55e2dc487 SHA-256: 609bf3e1ab497cf7f6d54acd151d532628d2520dc0479065875ea6fc0d031790
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many external URIs pointing to domains that appear to be compromised or disposable. The document body is unreadable, but the presence of many links to potentially malicious sites suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://archism.ru/uplcv?utm_term=where+is+the+aoss+button+on+ps3 PDF link annotation
    • https://seeandhearbetter.ie/img/shop/contents/91150406068.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/33283708993.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0056919001631235355.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/45298030790.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/23635667637.pdfIn PDF document text
    • http://gtshotel.it/images/file/32417702506.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7617121b1c2860ded5339318bee090b2/55912437293.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6d03c58d---nifuzowap.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/wolufowe.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/39199736922.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/95266946366.pdfIn PDF document text
    • http://besteva.com/upload/files/41504394041.pdfIn PDF document text
    • https://ms2oke.com/contents/files/tarubexomomodowaniwomepa.pdfIn PDF document text
    • https://ayurmitra.com/files/file/68264993658.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b3ebecbe889dfd74828329943cb406d4/wifililikazuleriju.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/48673014091.pdfIn PDF document text
    • https://le27.fr/docs/file/bonifolo.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/28607561135.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/godoguf.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210917061200_100812.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/nezejaduvitaboxagi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/32539277204.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/kewokesoziwe.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210914_02817E0E1F29E3CA.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dazokadelekoralagosudipet.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_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 10708 bytes
SHA-256: 3ff13077751908e322e5814d79c44d8a4d094b80a1cb27eab01f93e6de0531d9
font_01_sfnt_off0001578c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9E 18732 bytes
SHA-256: b4f57f74603f019c5eaf92af52c6125652430ad69e09553765401397f838dc2a