Malicious PDF — malware analysis report

Static analysis result for SHA-256 123a9ed42e02800f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 18:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9500f3821a610ab42c7fd8dee40ac8d SHA-1: 2598f69b7454fc54fbbb2a1e2a084559941a6a58 SHA-256: 123a9ed42e02800f1d670824bcd6bc745432778ba925535d7954593ce7c120ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to phish users or redirect them to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cvssteelex.com/ckfinder/userfiles/files/4270372888.pdf In PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/41196430867.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1c68fa5f13fadfa8b8338bd16537af87/16992086252.pdfIn PDF document text
    • https://blugarden.eu/file/minawe.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/93151370862.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/17323166500.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/nutir.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/6577419322.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091adb26ec00---pifute.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e59bb908---kimuwuruv.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160704f5546171---68881034296.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/97841463813.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xisidagoz.pdfIn PDF document text
    • http://herve-coiffure.ci/files/37294437090.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/vuriragidebof.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/34078476915.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/84608756699.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/ruguzetemuruvofu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2177bfb08809ec1c2c6fb24b439a0542/lunoxafenaf.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/foluvojaruwewaroweni.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/30491232242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2016+jeep+cherokee+repair+manual+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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 11308 bytes
SHA-256: c76d79348af4d6cfaa3e3d8d4339728848fc92c53e5f8be273284e14e3dd1bfe
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 17740 bytes
SHA-256: aa078d95cc439def17fd25419d1ad6789ccdc65bfc57f9a28a1e97b6d54b3581
font_02_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1