Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3d5748f3fece71…

MALICIOUS

PDF

77.8 KB Created: 2021-08-04 06:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf16f0ce9ed3d3a18be14ad9052191cf SHA-1: 4cd2f6f2246bb003d057e19e19e4480eb6bfdd78 SHA-256: 4d3d5748f3fece71d1aad93aab2a89deb61b8c31e0b01c43b64efabf51e10de8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://inwebjor.ru/uplcv?utm_term=construction+simulator+2+guide PDF link annotation
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a9a6c24---givojejapavejij.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/25164886820.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/91459038128.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098e2935ea28---92615256604.pdfIn PDF document text
    • http://apsons.eu/files/file/bozebogevugelezexim.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/22627089605.pdfIn PDF document text
    • http://htcable.cn/d/files/64164272188.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/37beb742449b2d63d71dfc9656e9dc97/68942944387.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a90fbb7121ed502eb7f132b82bf1896a/92404743263.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610798585b5bb---gewavujafizejuzo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ba47c6d39---sigosebimemurukabo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jalurawazegizilaf.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/iogufp7jcrb7cim2u0u4j15td6/49271196424.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da56dac2424---wusofiba.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/fubufopenutaka.pdfIn PDF document text
    • http://princeverma.in/uploads/files/ronofalilabufinigarosame.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ramamixunujubebivik.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/18559789021.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102d02c6607e---fiduxugiso.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0d723381---pikodiwisosugunurufejana.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bexinemomasep.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/3007669054.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/wetefomumezakol.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kuxonewuzuli.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846216a3384---992922890.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_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 16568 bytes
SHA-256: 855b98c11fbdf4a8ebd32a0985efde172f1630ca882d18f7191b208645bc3666
font_02_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 10964 bytes
SHA-256: 7c70010a361112159c94b9979e225b1a82b36436bdf64dc53a3bfa538cdc3cb6

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