Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ff89699a4cabfa…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 17:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca4aaade3a07745ba7fde0dbbf947cb0 SHA-1: eca66a58d82b775a42a4445753a2c2dcad73927a SHA-256: 80ff89699a4cabfa103cd3211aec920c78ab5aa8b231f127163dd625978bb23f
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 compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dentalrud.com/userfiles/file/bonemirojuruwejukez.pdf In PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/75088732098.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109040506415818.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631106037mirorokiso.pdfIn PDF document text
    • https://cmoretv.com/userfiles/wigonemagotizi.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rodifubijorifizuwidumejob.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/60411265693.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/nuxiti.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409ebe5eac---39566367347.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/88105031150.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130311cb94d0---lusivanoniparogosejotuki.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///87762918822.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/37214021667.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/30183401176.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/41155471696.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/rokomugigerivubolokaf.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50810664779.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/9855915093.pdfIn PDF document text
    • http://identik.hu/editor_up/60554817896.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe320b9df9---7767125552.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vegofimusisaxes.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/7164037052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=identifying+nouns+in+a+sentence+worksheet+grade+2PDF 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_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 16664 bytes
SHA-256: 3626615ff9a27b128f0836a4346a76e1a2b31ffa2a2fd3a421d44695bde1a4d7
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 11172 bytes
SHA-256: c0084d12925d175e3be412f9045ead8f7d7676dbe0db2a3dd61a15f0be7ea141
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1