Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8acfc695c6940b6…

MALICIOUS

PDF

88.1 KB Created: 2021-09-23 22:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce3ad94c3784759dbcaffe051ef60580 SHA-1: 73c4992d6ccd980f2f6306f7b48338cbc49f4b46 SHA-256: f8acfc695c6940b66a9638c0f3dec6a96ac4acb1d170613420b0fd303b1ecec6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely exploiting vulnerabilities within the PDF reader to redirect the user. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=what+is+keychain+app+on+android+phone PDF link annotation
    • http://d-a-s.cn/userfiles/file/1673037887.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/5210987169.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nefuwavopuketepikuzu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec832d1e9---lexusejamilavaxo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f249b81f---dipefifawitenadiri.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/tovof.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87940aa8b252af80a10d15187a7a1b07/finadudos.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/89958357999.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad21d2c4e---49784358785.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/mufiwokinepojolexaxuma.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/rukomopowuwaxu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/magepamedokedebabobibivo.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/92934768195.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d346b7c05---19115191667.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/napin.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b24248d2aa6c987d3b3c99ab6fcd9592/62645527603.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/nixuwuliwuzi.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/raboxemoleni.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/19250336238.pdfIn PDF document text
    • http://surtek.biz/image/files/20150323_191954.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/sawafegutifumagixowar.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c628c40a3---jugejof.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/17667548486.pdfIn PDF document text
    • http://keacg.com/upload/files/xopakiwilonetepikazow.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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10764 bytes
SHA-256: 4223b07a663ff6733b3e28eaf4e84d718911e5fe9879195ae7cbc605f74ed81d
font_01_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 17876 bytes
SHA-256: 45eddf2265cbcb77903852776693b89bd0523716d063a37b9f28b6d87f199a55
font_02_sfnt_off00013a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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