Malicious PDF — malware analysis report

Static analysis result for SHA-256 19910452cc97ea53…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 14:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be6ed2993e4c44c7dbe7695d45384557 SHA-1: 0df0e432855e051a46d6128914ea144d2ab33af6 SHA-256: 19910452cc97ea53d803e20bd80d4d0d6c165c1a4e307ba23f2d6f8befa7340e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload storage, which is a common lure for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d0afb6d---61992201764.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a5ef6da7381ae57ae437cae22c9812df/59838655293.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/76218483528.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lopipobotinoto.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9024663490.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/46689705731.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/zolemoruva.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/28239758998.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/6872716859.pdfIn PDF document text
    • https://aildf.in/userfiles/file/vatidix.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109070056048803.pdfIn PDF document text
    • http://meditopthailand.com/file/wegizutewalixeroriwozede.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613887dd3a63a---32592109314.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210910025844.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jemigitilewajikawuvewuv.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/34258369608.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2ca733394acf32b861209e30b689bd08/27139460028.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/79163345208.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210906182153.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/59659724110.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/wefexepora.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/23e7fd3bbbe85d505a73f51991712483/95992557860.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rijezazusebegukitugasirud.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/19036510717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jinde+meriye+full+movie+download+480pPDF 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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 17256 bytes
SHA-256: e4fbe2f529d7f90a50d05f8c46f1f8df1ab3f03c147ee5d16fcd926d10a79228
font_02_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 11156 bytes
SHA-256: 6a56885cbe0a51b3d75d4be2364690b97d47b8380c02df169f5a6d7d7b1fb59b