Malicious PDF — malware analysis report

Static analysis result for SHA-256 177946827569aad9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 14:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0d8b4c12418d1fff9dd853b9045a952 SHA-1: ba48b3b83855e6d13306c5f932d184f9c52761de SHA-256: 177946827569aad9e343501cc8977edf562f3ccb1dacaa85db85cf10e0af6e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=general+test+mode+android PDF link annotation
    • https://oxfordjsr.com/userfiles/file/zikemewus.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/bekibikevazenoxupifabi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fuzusesik.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4740aa05---54087688019.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zawobuvotelu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/bujosovazebigibatotawi.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/68909444719.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/kexupebazizafu.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/xugamitagidajosarazalifa.pdfIn PDF document text
    • http://didopack.com/files/rukiligixaku.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/99404540589.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/mudikigupur.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/18966964009.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/nusewe.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39290054194.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fepela.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090723570688.pdfIn PDF document text
    • http://creationart.hu/files/file/75157619781.pdfIn PDF document text
    • http://hbaoge.com/upload/files/96990968838.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/08c12781745ca947775daaabc42001a0/87900057534.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/gejanofolisusezadixune.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/sexifigi.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/79877064712.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/811b7df00792ef716181b6dac30abdf8/97433340065.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/nubobozigoxupupaboxizopan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 16900 bytes
SHA-256: 2e5831c805e3a7ca4b7ced6a98df846776b69fdffed8dfcad2e2206a30b56d0d
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10448 bytes
SHA-256: 193c70b783425b4d7b674bef65647820a6ce6796381ad348603890f340e93c8e
font_02_sfnt_off00011f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1