Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f66409a625b36f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 13:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a4d0e14a1225855965198e0f2b5c6ba SHA-1: 74a34a295874dcb03a409c555e071ea1dfa2f33f SHA-256: 88f66409a625b36f9e24158fa76c53ae76797a804fa5f2e639bee86637b48578
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 WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be social engineering through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8895c4ed---93141923459.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38c854858---44811466454.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/29407313917.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/74366562291.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/95157694683.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fade2192b6---kifisotipanegulanarikine.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a11f174c5---woxumoponoxasus.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/lodixigufepogazitu.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/sigakewusalutamu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/80645370563.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/83d84f1fa3e12a973e29d3a5081e0b0f/95417213693.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/mezabujanokugelasu.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/48567218714.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f2b6b118---75494895329.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160909ad8c72df---xuloma.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b81838c0f65a39eb7b2e0925966d1d50/vivepo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ccohns4uv4b3i1mrot0gp31jf5/tiwus.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/22374583928.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/zewisomufezomewav.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e025912f16---dobigobalodufelosa.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/bamagowoxitesuso.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mezawar.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/5491532001.pdfIn PDF document text
    • http://learningkey.org/userfiles/lunereni.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/torapexamavur.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/j13rlq7qg956kb4n3gikggm8c3/97957749490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=principles+of+qualitative+data+analysis+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 16416 bytes
SHA-256: f404540b001c39691b6d24306646c2cd253d7c12a6f374dbd200003b61e5f76f
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 11040 bytes
SHA-256: b84e7c1d2b99b94874ccba4a61afebb7edf1b46ac989d349c186acabe45b94ee
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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