Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e34ad9168706d1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 12:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 630421ae30051ae6566c2e2826910cf7 SHA-1: 3aa4f4991d09aec44dd90c2226cb65fcc4eada36 SHA-256: 88e34ad9168706d1d09b366bd354ba1accdc344b9fa3275d745a6be7d9f89a13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://onnetsolution.in/userfiles/file/24492460925.pdf In PDF document text
    • http://ttworld.hu/uploads/content_files/files/50961703479.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/famaxizizox.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/xupadog.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/44051400761380fce93a20.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/67240511912.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139fcbf3fe---71250797586.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/wovudojetozi.pdfIn PDF document text
    • https://podimercrm.com/img/files/rokowinew.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/gikib.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210925041019.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/bifalupituvezozenef.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/benezefajovale.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/83765477273.pdfIn PDF document text
    • http://egitara.com/upfiles/files/zefexisunejo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614de61eb6e4b---kobunidepag.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/43420315269.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d62336c77febeced1ee4b93e5966161c/xezazigu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/xizil.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/12500422574.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/57550171793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=france+league+table+standingPDF 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_off0000aec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 16284 bytes
SHA-256: 01da4727dadc67127fa726b11a6dae433668948bcb7e08b70f46ab0bb3b99ce3
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 10644 bytes
SHA-256: 92463456d1d3d5ee2b8ded2c417b5ebcef46775379aa22c91e9f407f7b1ac2bc
font_02_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1