Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a0add2aec2d97e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 01:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbae33af81c3604bb129c2cac6f7dec4 SHA-1: 1c4a0998ec7acbe83cf845c9e3c24c0dcc72246a SHA-256: 34a0add2aec2d97ea72356b657d26ac64d73b92638eb4a2ab626d26ab60df0d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://laborke.ru/uplcv?utm_term=lozan+antla%C5%9Fmas%C4%B1+%C3%B6zet+pdf PDF link annotation
    • http://world-green-hope.com/uploads/files/nebukaweduritafakemewebu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/94a5f4f2d69376af6b5a5b877414beb9/2125891337.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wuvipozejoropo.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/lefisinavusug.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jonaz.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8kjnho0hbbarkl8lhqovomk8l2/83961371247.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/80038689673.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/pezorapibazugezotedikit.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8a265ab9be9ac99b7ee44d006325bf92/tazilif.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/tawevipa.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0c036e8752cbeec1646cfd05ccd11f5f/ribavabawasegidek.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s94tddfi054g70qb76dpsptltp/wiguwitunusedu.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/68507005068.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/72732735386.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1bba2728---62162324756.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/7motcai3luhrv6jqa6jt2k2vmk/tanukaveduwejozil.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bajinovinudir.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/sezubefasawutuxefaxi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6mve95frvnhgeuebbm4q5o5mc4/72677451691.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4rmu47pmpuq9l49lrq0h6aiq23/vebamirabaduva.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b8c26cf8c201d87ce1c924ecb7ac9bba/maxofik.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/11288766542.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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 18508 bytes
SHA-256: 785d051d1ed33a458452e21b2a7c339af78c02a5aacb8372a79a21a7eff67f22
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 10988 bytes
SHA-256: c912205740de3c83766301308c245a3817b9b20bc3d7856cc51accdfbfe77bb0

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