Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eb2df7b998f300…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 21:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2a2bc5aedaf6fb1ecb9402c918cf3a3 SHA-1: 4211a82f68e6a6721b6e9e2c3adb1d81f60efeb7 SHA-256: f5eb2df7b998f30051084ea1f9bb54334140f9fb4b1e4b98d8d5b22b1889e420
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or redirection attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://catamma.ru/uplcv?utm_term=chinnasalem+rajeswari+theatre+today+movie PDF link annotation
    • https://taiwancy.com/app/webroot/userfiles/files/91919205838.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/99930111756.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/94868486691.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f7c05ec---sulofi.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/47307040064.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5b10b320eb7d1c21d5b335c41dc69671/rutotugekowijagolozovo.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/bixuxotabuxugara.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/renevolafijaxupamute.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/21858934406.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/wovibapatewaguwetute.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/31991231088.pdfIn PDF document text
    • https://okazionche.com/files/17157840641.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xakiwipabelawabazedejo.pdfIn PDF document text
    • https://aildf.in/userfiles/file/65563699863.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52125250688.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/10338987964.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/zefogewewuzixitenegimejuj.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfd4b73b7---52766912048.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/notudomatalirabomuraneza.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/36711592332.pdfIn PDF document text
    • https://sergiomauri.com/images/file/tagoxejosesapuwi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc214080b8---25431221691.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210910132146.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/82939904640.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e9o5knki9e6f14lc1vtqt4fd47/45290557748.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/sokasulonabipojit.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_off0000b886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB886 10940 bytes
SHA-256: f56ba3c419a9ab3493d8160286c86dea6848acf7c8687d88e0a9717c7549ccb7
font_01_sfnt_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 19268 bytes
SHA-256: e10d0fbfabac3537a9caddbb740db7d2b66b4e6853fb34fe5d90cae94788c1e0
font_02_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.