Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadd94b1a912f945…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 17:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d29883b10a7c73ef8e27cf5489efc39 SHA-1: 02431d5f4ee1d7d212c2cf075af23ba44a2de29b SHA-256: fadd94b1a912f945420f7e52f32c2f81e5f9c2099ec0b52bb2f400ae6c3acaad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external URIs and links to what appears to be compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://coretry.ru/uplcv?utm_term=geometry+wars+3+dimensions+apk PDF link annotation
    • https://vsetinrally.cz/userfiles/file/18126320034.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/39156495792.pdfIn PDF document text
    • https://orrizon.ru/images/file/64517393450.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/87255063476.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/49064247234.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/tenovaxadimib.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/26741161801.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sedonedux.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0c4e72c5c97a88d55f7ca8af48dd533e/gijega.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/78331533695.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/83860543368.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/bidotolotafinitufojadubu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/xugozopamewugidajupox.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b44ae285f9d899c77e8908ca51cafa7f/rikekisaketumuxix.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/35240106365.pdfIn PDF document text
    • https://iword.de/userfiles/file/kabatuniluvopumazukupewar.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7545e1e4b7d2fea7be6179efaa2f2b53/52652872610.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/tigiperofavavixek.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/xalopilizutogiwexupemugop.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/15684654829.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r0q9educ8aqsv7bcd5dgvfka07/pidogabowelo.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/samebajovibusopivuma.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/76076212427.pdfIn PDF document text
    • http://headrepublic.pl/images/files/zesebozagawagopujiva.pdfIn PDF document text
    • http://clingac.com/d/files/saxomonibepibiza.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/winanugebekoji.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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 17524 bytes
SHA-256: 6ffa7854612f166cd6a0d72ec8f74d35c2e2f567289e54cd79b38454ebcee183
font_02_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 11012 bytes
SHA-256: 14d17d082aca39f591bb4d5e0732220db805dfc4d646f3e1a8bef9b8be816549

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