Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eb95df029f5570…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccc0634a3999aee145849a5a946be142 SHA-1: 479309b97e741daff3b8a4d35673c0d5054f566c SHA-256: 53eb95df029f557069b8aff38ebe5bb4d68779af23c0ac1b41ad26a3e32d436d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings are sufficient to determine its likely purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=a+random+walk+down+wall+street+2020+pdf PDF link annotation
    • http://dawahcity.com/userfiles/file/losizemesopoxu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/1275508064.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/bidovatorurunagivorusaji.pdfIn PDF document text
    • http://strandedtattoo.com/file/xozilalagexikisotebado.pdfIn PDF document text
    • https://km2804.com/ckupload/files/87071863737.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/45636378670.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/37092466205.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2c49ceeb---32838371399.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/83948877706.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/47527312045.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/nowidemupukizutokakosusur.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/81259548744.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/segepisikasakosag.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gugonigexiponof.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/tegosob.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/rurujok.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xasoxoxadubo.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/55990498415.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/malokizovutalegogolebe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab523d887---foxerinuvavibejipinugoj.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/35301226450.pdfIn PDF document text
    • http://lachina.cn/upload/file/vitowasup.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/71131921152.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135591acbc35---89560051935.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/1238885751.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xipudedanazegif.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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16276 bytes
SHA-256: fd37d6a0ab8aa094a725c4c6bd3055fbff9ac156d81739b1c7cbb674befb01dd
font_02_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10968 bytes
SHA-256: 8c297211b88e5730d3028ac33ec5180346bc9cb48800ef06829c7905e0d6579d

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