Malicious PDF — malware analysis report

Static analysis result for SHA-256 1942fc6e15919af3…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 05:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 774607b1e9a09b0e2fed42301cdf3739 SHA-1: b22ba4abb169ddb74d4f81df98337530479ceaaa SHA-256: 1942fc6e15919af369ea3b8cb807b0b963bd674d84b27ab288476ee50e50a03a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/18e4bb3462cb2860a62034765e58f9ea/fudusedogapum.pdf
    • http://519pf.com/userfiles/files/zimojolutavumewuvurin.pdf
    • http://pcwenhua.com/uploadimg/file/1630699698366406628.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/parasebegopuwelapugeteve.pdf
    • https://ibrahimkoc.com/images/Media/files/zolisanutasibudugewog.pdf
    • http://eca.or.th/ckfinder/userfiles/files/kibajovug.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b0de4f4e4e7b67e8fc0aaf4d995c0703/67762381681.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/91370175096.pdf
    • http://strategie-online.net/catalogue_dynamique/file/50234965137.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0382c1d8---muxaxufozirotasipinefis.pdf
    • http://archi1919.com/smlclub-files/file/ligamalifumejagogamenej.pdf
    • http://hongphuc.vn/userfiles/file/fixenodatudugotujaxuxa.pdf
    • https://dalilak1.com/userfiles/file/palolujekorexe.pdf
    • http://dekoblickfang.de/userfiles/file/69734977057.pdf
    • https://vleek.com/uploads/files/20324785218.pdf
    • http://denki-shonan.com/uploadsfile/vuwazujude.pdf
    • http://motopujcovnateplice.cz/userfiles/file/69674587627.pdf
    • https://galedo.cz/www/data/cms_files/files/ridikufozovevetogi.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/29199331345.pdf
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kefinusuwoxurirexuzo.pdf
    • http://studiopol.it/userfiles/files/wexegabulemesigukelafub.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145099e2b1c2---mebewuzotatepawoputogi.pdf
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/munoziwugojuvari.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lucky+patcher+for+android+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b88d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 16792 bytes
font_01_sfnt_off0000d0a4.bin
28a2421d312139df301a98b70786b552812f2801acc63fc32ff54c1c603a916e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 10768 bytes
font_02_sfnt_off0000e96f.bin
d386f5f5086ddffe9f58f32dfc504adea1e95f4cecf71d680a8e892459f16b25
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 18852 bytes