Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54aa52557f6d8f8…

MALICIOUS

PDF

147.6 KB Created: 2021-08-25 23:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2abc89ec30134bb704353680ed86d5d5 SHA-1: 1dfbb5925bca21404f88fc3601d710415180fd16 SHA-256: d54aa52557f6d8f85c671be27bed2f04a5422c72f52161525ca13382e021a64a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=mickey+mouse+mickey+mouse+photo PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9731a4920d---73396894627.pdfIn PDF document text
    • http://holzweiss.at/67578519374.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/87365242770.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210814191845_j9gxie.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/52751905877.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3718312b4a---dumikir.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160730bebed42f---94076625856.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/keziduroxiwoxite.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e655d0c6---9057925323.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e03ce636c---jidetigival.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/tujitutudo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d6ef71ad66b8b23243a93a50e018ac44/82255197135.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/vezewefenotezifo.pdfIn PDF document text
    • http://108homed.com/userfiles/files/23944345312.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af916ada84e---rovubanenunajasunibaj.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5e3db583---gazudenilakedomewoja.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7b9b0a9a1126a700709eab382a825bdb/kudisedajalaxevukexilofur.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa985f38cbf---porepidasagakuvalew.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610459409b588---bixagof.pdfIn PDF document text
    • http://mextro.de/upload/files/21438075562.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/femuwubaxosatinuseduxip.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210710112530818010.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_off0001df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF87 18392 bytes
SHA-256: e5529d6f453148cc23e893634899d34f6d1cd959741b2eb929383240fb399458
font_01_sfnt_off0002100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2100A 10524 bytes
SHA-256: 565e75b34af58f1167a4e248530e461bd14c3d5a63b666f98c189ece14f425a3
font_02_sfnt_off0002281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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