Malicious PDF — malware analysis report

Static analysis result for SHA-256 586d9baccb73ad56…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 09:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c2c4e49a36a3f2a8fec63eca6f7cc783 SHA-1: e7faaed43335bdcbe2bd8de090ded76efd9c861f SHA-256: 586d9baccb73ad56ee33fafcacfcf75af2b0bf06e9930ee5f17133b48b791023
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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://stark-tools.ru/images/uploaded/wofovurogodevez.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/savun.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/pokajeb.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/gakigenude.pdfIn PDF document text
    • http://ruresept.ru/files/file/xesokoludabuwoxobimoj.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b402e2bc614---52079384199.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/48a85052e73b8e0ab2881b339a25aede/kuwevevumatutarirupafuzu.pdfIn PDF document text
    • http://darec.sk/files/files/26591072854.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07c7240bf---57717680634.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7340498173d524f69d6fd24da756be3f/9682469747.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lutejiwulolanojutunigano.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35b6a6cc8---86020503112.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210513023829.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/85551b4a592aceca838222b68992d480/41143708271.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0547f987f3e1ec60da9c23e30d56c0c8/86534384100.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/54634414331.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/polufukikux.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2875e28789---95101537518.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/zifaxelewanib.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/35957117040.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/63vv1qigebhvl3kfmhp4ias3es/depegizif.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lajixojuduzem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=8th+class+math+exercise+4.5+solutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 18092 bytes
SHA-256: 53a2ded4c7524a23c38d7ffd151ca0ca390fb30db5b8d35c01968f3802c0d84a
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 11088 bytes
SHA-256: 21bb760c88dda9b4cae4c420061ec860642ccf3ae113b60058a4986c205145b7
font_03_sfnt_off00013b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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