Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d5a6ec460f987…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 10:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cc34df6dc818553946a8015f98c6624 SHA-1: 659dc468c89b9007f09fc7e56b6b6f233973ee96 SHA-256: 231d5a6ec460f987071115b134388ae26e7f81ba92f5373fbc3a07984ff65bab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term=bitlife+hack+apk+download' suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://allytemp.ru/uplcv?utm_term=bitlife+hack+apk+download PDF link annotation
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/5841027835.pdfIn PDF document text
    • http://shamayachts.com/upload/file/24608905726.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/52751562991.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210904_505167CB0671DD26.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d8a30f2b99aaf502f2b47bac038148a2/18272149099.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nexiwawapivelibe.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jutitowim.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/tuzaxinifozazajunutumitad.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/mamulafaxukoxal.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/boredebapanerojupo.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/73952592023.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f729fcaafa---88979436875.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/1517036958.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/mupekizofojusutovisuz.pdfIn PDF document text
    • https://pmms-online.com/assets/file/71532708467.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f18689a98f25dbbc56b665224a9ff4b6/bovumude.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/luzodesofa.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/giliguwarolukoduj.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/81429541632.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/mivurakejitu.pdfIn PDF document text
    • http://vecsecity.info/editor_up/92483460602.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/juzaxevavotofur.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/powawalegeka.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/94900464266.pdfIn PDF document text
    • https://solturism.ro/images/file/bizewumejoridobes.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/53726893428.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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17980 bytes
SHA-256: 64d5061722a59ed901ca94cae2fbb419360b30969f0cc9b7fc946797e3abed51
font_02_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 10680 bytes
SHA-256: 3b82a32b43779bec217a2d2a24657ec6ebcc60c740b7282d6d3bd5b55c1b2659

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