Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0340632ba616e7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 23:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3450da8d259675468dd2bba629e0fbf4 SHA-1: d2c1dea3c7b34e819c21c098cb86116391c7eea7 SHA-256: af0340632ba616e7ebd04d00e697c69adb7d947fdd093347f449fc39c1ef557f
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically a payment redirection scheme. It contains numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://cructi.ru/uplcv?utm_term=free+download+pou PDF link annotation
    • https://gestionarival.com/userfiles/file/pivozediburapusu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210918024520.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/22582849112.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/zuzib.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/niwexadifejunonazimasi.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/romuvafataluwituri.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631896309datuvejuxugidugusowitax.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/lajifalaronenogariti.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vevubizakorilanam.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/81083052354.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/4109180988.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/pejezivuvemanige.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zidawovuvom.pdfIn PDF document text
    • https://ghnservizi.com/file/41576642356.pdfIn PDF document text
    • http://medi-sen.com/files/files/temepami.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/87583798039.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/jujowolowiton.pdfIn PDF document text
    • http://waypl.pl/upload/File/somoje.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614534f400733---vuzuve.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vukoxabikakefitunozikev.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff24f3648---80153870671.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46825950901.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/77362788759.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6681bcb9---zopipugofakofesaben.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/linumetov.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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 10188 bytes
SHA-256: 715e9f92834e05e61828e01edb6cb30535393fb12033c7c445ffd7d138ed905b
font_01_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 18444 bytes
SHA-256: 283922c70396b6119252a99c73b2376da0bc202ad3d7b966256a33e3ba2836a5

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