Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b0b627f6f2e0dd…

MALICIOUS

PDF

87.8 KB Created: 2021-09-15 20:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96d040528fd9819ce9aab53e6b41174b SHA-1: a0a9259c9129cdaf611dd1c2bfa8748c61ea154e SHA-256: 43b0b627f6f2e0dd36b52a54b8358a59a496d2cf24057992e78260f23e076190
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=the+formation+of+oxide+ion PDF link annotation
    • http://glttek.com/userfiles/file/31376848361.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/2634437385.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68289437492.pdfIn PDF document text
    • http://tulga.ru/editor/files/77468619377.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/137b5f4ab891c7fb14f2d9071c80fbe8/zobupanul.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/45102915790.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vovokawuguminegelizoxin.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/narete.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fca4cdcdca4d0ee621e3cac171ac42ec/10752878324.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/bagesixutuza.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/wifit.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161399664bb722---34058641556.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/dixarifabigudi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81416378133.pdfIn PDF document text
    • http://debten.net/UserFiles/File/fofedixe.pdfIn PDF document text
    • http://tavio.su/files/file/98463521133.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/ropemekarifabowegug.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/logezenaxijuvufid.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/bivabavamawasef.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/93601635360.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30cca9736---setisewadubikaxor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af9e14fc8---90866425729.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tunebomupixekogok.pdfIn PDF document text
    • http://amdind.com/userfiles/file/meximaletikegudemeloz.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/waditizujoxika.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_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 10468 bytes
SHA-256: f6053bf8407eb36a2bb7ae7cbf557a9d8ebaf1b13c3e0b260035ed56ad2135c4
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 19740 bytes
SHA-256: 0ca8336524c95360bfff16e022bf6930a12d96f23b5ceb22fa38ccafd6b25794
font_02_sfnt_off00013984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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