Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba22826d20aa6ef4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 22:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ec4102a23a4f95bf59b90ba564f40fb SHA-1: 839ba2e5cbe263aebccc0d063730ce9553807b7c SHA-256: ba22826d20aa6ef474a6adcd17e1c45e58320b7cdba49ff6bcce01a881c2a3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=sat+reading+comprehension+practice+worksheets PDF link annotation
    • http://applecentervn.com/uploads/image/files/22359206234.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b275a495d15---81709471463.pdfIn PDF document text
    • https://mimpidia.com/contents/files/dotidove.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ed58e57a653a2485ad2d1f3b6024f44/52991808932.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/11253028130.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/migugiv.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/zitabatadigejigogu.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/63986100492.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160842695ad36e---xulukivatewejodira.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/76029677826.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/22164005194.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ee318f57---kukibapomisasuleso.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/27416070201.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vipilafijuwu.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/85449895744.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/76487648373.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/kaxeborewatosirixotoxaj.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/34e7542241b02ff59b694082fd16e2ee/faluxafovajaladiwejogej.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d6a5829e4---76140353723.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/dijiviwanogejibanejat.pdfIn PDF document text
    • http://aqcons.vn/upload/files/31430873650.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vasinalefafun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc36109a65---29038006558.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612633a525982---luzigusaresij.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nulelavadexizukefavelabor.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5gim86d7tm2k6j5cl5u4b1ga0m/84147092970.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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 11168 bytes
SHA-256: c09977cd5d266fb0fde2ee814dbb7d04c87726e54c1581e28060eb41bac32f50
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 16556 bytes
SHA-256: 3145b486e70d2f64f4cc1d6a30669782e7f1fce47ecec111671da1bb3f15c87d
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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