Malicious PDF — malware analysis report

Static analysis result for SHA-256 093a529259a87810…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 18:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94ecccf0bff261109d6fd0fbb0c7f6a4 SHA-1: 1116ca48a2c4bdb037e74ef8c92f6c28a2e0b6b0 SHA-256: 093a529259a878104a2e7b34147f010790befcbe12c97c6ffffaf9399f2e95c8
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hydrem.ru/images/file/88206219542.pdf In PDF document text
    • http://cutyoursupport.com/userfiles/file/78178072822.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/xonibu.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/80160082343.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/809790020.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/gajadunojatubalobi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/24133782347.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/563534848.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/diriwi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/rexunuketot.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sixoxavamulodegemufade.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/36385553921.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/40924563591.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/momezujez.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/12820167591.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/65293522843.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/50794782611.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2625f6e1d7d0da969a9ea246e53f109d/27382847211.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b1io508lcekhbminam221fsc87/97519834553.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/33342927169.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/6234931354.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161416c55a01b2---61252787944.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d1072bf---novirifidanuziwi.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/92909095421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=clicker+heroes+save+editorPDF 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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 17668 bytes
SHA-256: e69818e584679b9dd0fa24eabb7486fa0421bd3214c686174298f03811dc671d
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 10552 bytes
SHA-256: 2cbd892e568a6c2be04ee5cd4c0f517cb62184c5e94d2ac4b713de3cf9ae0c18