Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2928305f4eed2e…

MALICIOUS

PDF

83.9 KB Created: 2021-07-30 21:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68a1cde0bcf1363529869f3d9aa360bf SHA-1: ecd2a3169b88970dacfd5a8f1534649c7b41a64b SHA-256: 8e2928305f4eed2e918f32bc365a046df39dc14c0cd48ee049ae9014a63e916f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=the+musician%27s+guide+to+fundamentals+3rd+edition+pdf PDF link annotation
    • https://mimpishio2.net/contents//files/66021883189.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/88602431b388cc0f8d5296207942f3c1/lunebozesajewin.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/sakasisap.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/27978744199.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/nirupanolugikudesabipitep.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/mujojekemogaji.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074d42420153---numodu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nra5nurecu6s5854p3av5qjum1/3436739707.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/sanuwezofimevag.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/23650906030.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210605_AEC0C582D0B925CD.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/73485720376.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58021435704.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/lasamisopepejomegafa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8b9ff4ad4744ff7f946bad472e61a8de/69565946976.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/mikuwox.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f69ac81806600da27bed1214abffa3ac/dipelufejeta.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090269fd5a21---30941990162.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/a2ec52017521a7200429226b0ac5cff5/zefaxadalarazox.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7bpq02u1o2osetqohp8bo5ol6h/tutuba.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/lokovifibivulujijub.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qjivief29cag9k11n90eu7fmbl/51344186133.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/bb06dbc900d22d20195932d9c1c8c0ba/27938873679.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 16472 bytes
SHA-256: 08d744fa29d4c274e439eb0f90415bf6020931f98f502e6584b0095c6f100bc3
font_01_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 17116 bytes
SHA-256: d4e0ccab45be9370518d99bb0d5409e8a03771c641b2252168bea86b73883dec
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 11336 bytes
SHA-256: dccd66d15bdcbe13ef156efa9531ffb7c9574a5130078f3e9b9e302f72b2ba95
font_03_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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