Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa58633ade3d1b4e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 02:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d0d76f8fc45e770f7e8ed61c5621e6 SHA-1: 431b3fd165d61966b4edf0d3bae9de2d18fd97f0 SHA-256: aa58633ade3d1b4e8c28f2eabc315dd87b927d3176544fb6f0ea88281abbdbd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bettynblue.com/upload/fck_img/20210801/file/zupizigegemuxojofiril.pdf In PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/70576661135.pdfIn PDF document text
    • http://greenbrier101.com/userimages/zovidirikilerevaxanobuli.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160778917353b8---kebapexuzasuledumil.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611edc35c22c7---lanarug.pdfIn PDF document text
    • http://sparkpro.lv/content/file/25115001264.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kirasadafabuxina.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/zasizumasisupaderenifuwux.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/nibuzoxez.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d068e20a38---libokagavatisef.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607199504a5ff---dikinelotofodebakilabox.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/52705su8agqsupt4osnrpp61o8/bigezumepomironidagid.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8b81fd55911f87cd6bbe699dc35e4973/bitalibiwozuxagulujaju.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c38c7ac9fc41995c42ab6e19a49e4d01/wawowomolas.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/poakcmeuc5l04vsjqs1f419qgb/81672515975.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce586db050---90137295522.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/wekaluwapirufukedigiwokex.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5290e203---rufejokewinedomowif.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210826_FB4A5197182AE907.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/63f606e31fbf5e4acf0b525c414d15d4/14613370096.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/86893824410.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f5b015a016ac4527e92bb782a0e1dd2b/mefak.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d229ff6b662---wetopularelisaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+love+by+soborno+isaac+bari+pdfPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 18476 bytes
SHA-256: e9101d47b9fd6f5403ff144c4fcb1908d89d2c7c19d0f047a2a54ad2888dcebc
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 10900 bytes
SHA-256: 2800d4c98aece98b9dc7ecc2ff7a8cb321fbf77fb42373eafbef552ad2f6c3a4

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