Malicious PDF — malware analysis report

Static analysis result for SHA-256 addb02ab380e92f3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 12:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd79e0a826b97423739179e75701f62e SHA-1: e4b2de5b8548f4ab059a2c1e438bccd11ed57bbd SHA-256: addb02ab380e92f3731cdf6cb138573ccd55575de9693975261dff827836e7c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://reafamily.lt/ckfinder/userfiles/files/28255610102.pdf In PDF document text
    • https://fototipia.hu/files/files/rebagubod.pdfIn PDF document text
    • http://cobmedia.hu/include/vojomuf.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/98114752689.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/57528990945.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/sesuraxete.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/walixosikuwi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ju9l68j3a3db8gnbokuu6r1lgb/16499063494.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/872f50655252c7395d6b44b9a65debf5/tifobamobiga.pdfIn PDF document text
    • http://js-space.de/userfiles/file/46987952140.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/30144518136.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/bifimulakuboguba.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d67a7892---fiketotamuguwusakos.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/povoronakofudaxitorena.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf7241ff4---4243948560.pdfIn PDF document text
    • https://arerp.kr/data/file///gifopomaganowegi.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/rezisanenubo.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nunodekopatepodebe.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fl8ep6herfd62bl8egqc13rpvc/pipililidefomevixol.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/tuxuridutesu.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/gurasekonizamonuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=solving+rational+equations+worksheets+with+answersPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/89071307110.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_off0000b579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB579 10952 bytes
SHA-256: a580409b1358b2f7eb05e778abdf6cde6280c10d658ba704aa14f8431b65e34f
font_01_sfnt_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 16440 bytes
SHA-256: f6723a5a251f039c5ef282df1f79f6ce79ad68e2016797f56b154372c6e9a899
font_02_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1