Malicious PDF — malware analysis report

Static analysis result for SHA-256 0044f9628e057f95…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 13:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c970fb3feec46f20f8220a273504863c SHA-1: 8ecebf3ca1f1ef26f468a4ba5aecad685a266419 SHA-256: 0044f9628e057f9516d1bd8057254220aeeb35680f1305c3cd8cc582701c5ed5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery, disguised as a utility. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/nifuseretebuziwuwe.pdf In PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/74091108812.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161337a90f1b01---41285170112.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sunodatok.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/roluvinubasubejirago.pdfIn PDF document text
    • http://espwireless.net/uploads/file/74116678721.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/41282270089.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wevadezodavegodixililop.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/204420056.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/bopirazijevopu.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/79470153152.pdfIn PDF document text
    • http://jucal.es/images/file/lolumowowarena.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ed5d4c7---walujopage.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/wopufaxemo.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/92836777781.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tifigasugepalexijide.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/35758905596.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/viroxavo.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/vewezefukewegesarewinuzar.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/lemiguvowikabofakisik.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/41694441568.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/42773649475.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac8895c98---bagenipeviwuxajiwida.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/potiwefololoxaravolapete.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6211806f---pukigoxupa.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/wexixowivetolevilebat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+to+word+converter+software+downloadPDF link annotation
    • 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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 17084 bytes
SHA-256: 98a0f1b57ad80fd2fe75156c0e4090c652af24c5b65b556f95b6e90026d11940
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 10532 bytes
SHA-256: 431893bbfadaa421c2c5688b13c76b47e0a2d5580cf09af26f8aff7436c5f102

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