Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d76237625893d7…

MALICIOUS

PDF

66.0 KB Created: 2021-06-13 08:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2628a9bba8c2b276523760d06ff9b184 SHA-1: 583124a42ce542ef7644753d5cc3a820ef4fcbd1 SHA-256: d0d76237625893d7e1afae3061dafabe423964838faa09e04cfa9fa63b3c983c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the document's structure suggest a phishing or malware distribution scheme, likely using a social engineering pretext related to online chat services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=mirami+chat+with+girls PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607722c1c9503---tajomul.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wavetexivepuvavo.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/42823778047.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0ad67bfdb3172dc94c043c6af1a7f340/makakezekebivevuwog.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/vewajuvovibojedepimedale.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5aa3570e8---8111215406.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/ludegafos.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/91i917fc598mg22vfrlhq2uvb4/kekimozegirade.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kddaqfadjio506hl7md5603jpj/vumudexazajutex.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d006bdad9870405fceb9873c3037e647/jomanule.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b43fed176---wesuluxisalunu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af08500a67f---gijamiwiwibim.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nevisipuxugiromisi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16089abaa6906b---vunubot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 5308 bytes
SHA-256: fc56d84c4b430198581d1e2883091a90a808a710c23d728af71e4f4e4968ec46
font_01_sfnt_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 9668 bytes
SHA-256: 17c5b96c4f771cea1853bdf735048954996761f61a07dc20740e0791f73cdb7c

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