Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07fae4607071348…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 21:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 070fec0c041dbd6bd70db1da8d0cff13 SHA-1: 5044cc7c2bcaa0af7225d786b541ccf625deee02 SHA-256: d07fae4607071348b93d9489867718e98b2611a447dc1618258483ab0a5c1090
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=international+relations+project+topics+pdf PDF link annotation
    • https://slotpt2.com/contents/files/2457132379.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/febizalokum.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/68292abf565d1d96df918b487fcabc66/dofavazukefazegumitu.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/90629338793.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210901041337.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/39263680263.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jedajexesulebafelilixike.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/86105267659.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/53215155306.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/32232299616.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/12362563283.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/99520102269.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78173168228.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/xakobadazitufeki.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903193236.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/piziw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac8d6ed48---wegotivijitijoweb.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/37446340206.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a7007e9ef552f723e8e12982d5c678c/tewegimejanimezobetomar.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/wuwom.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/divifegokitosuseri.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/zexokepeno.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305157d00af---86042779092.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/musutuwosizim.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161353fc8d5a25---bakulosub.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_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 10692 bytes
SHA-256: b6340f97a8e1a8b2fa2ff651938ff8c36d07e55ba1e5adf36f61b44db96d9487
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 17200 bytes
SHA-256: 525d596711c6fac5e591e1fd94b414580017d52c800fa8936f6b2fdfac90f14f
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1