Malicious PDF — malware analysis report

Static analysis result for SHA-256 b822970d7cb8ebce…

MALICIOUS

PDF

79.1 KB Created: 2021-07-26 21:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2353b9df3d3aaacabd587b3f3ab25a4 SHA-1: ea6367c53f3f13aafb1da4d7f0634dadd41c70c8 SHA-256: b822970d7cb8ebce2f5e2b1e1633750c40c80691b8737d43d560805b418c8dfb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/12604567448.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb3b9a646---guwalufowad.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7933028362ec1c41befb9f6b6993053/46366912863.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14ad013d4---58560476256.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/jatorezosuridis.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14532a519---19079178045.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceda78808b---3930616278.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d506ad4070---debikexafurixofamisilajax.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p3lvanqt6tiuj193rdgnpa6md6/zoxosevuj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907a442cf9f---mogemukijunep.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7484207dee9a4a933603a430027b1be6/vofimiraxaxodevoxir.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/wavixinexo.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/kawib.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/mevalipajusonafonamiwafun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251fb39bce---zagil.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7plccpv7kk4i6vf44o3infn1g4/xuwudinukunaxeban.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/i2tedrk69pitsdnenekur2s485/jizepa.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/56198180336.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/lategepidafi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/96302084110.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/mutipowoto.pdfIn PDF document text
    • http://rilta.net/userfiles/files/wojezogotegubofano.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e3142048---65627567331.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/3040980228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=annamalai+movie+bgm+songsPDF 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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 16948 bytes
SHA-256: e318bb6d81f78bc091aa836de175320d346d6456eb17a55a1449c668c90357cb
font_02_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10440 bytes
SHA-256: a4205dd667f28ba06dc3fc890b0c70c02457af7651b18933813979bab655702a