Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06be797684f6074…

MALICIOUS

PDF

74.7 KB Created: 2021-10-01 18:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8bfe314b75100d7f5924f33f43f48674 SHA-1: f391753eeec595533b766712e6d2dd022893b82d SHA-256: b06be797684f6074294b292419ab83e5f0fc9b2159544b0ccaa74758e6573b5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/mipizorabuzukuzupe.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ad6356b4d30b267f6de88bb081dc3843/18648987308.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/witixarijivop.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/gizoruwewubamujirobiwud.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/33077318638.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/kakipaxutasuk.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/bagovuxemidival.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/fixepiwopew.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/nutofagu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc03c19c8---45008312049.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xurekewufaxobab.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/safeto.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f2l3scobuo0b38qvpocnmb80a6/58384121128.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905165957.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e19e4b18766cda03bdcabcf8c2d68b8c/rovumamunukimimo.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fifupogasojewixer.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/52147023096.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/jutatigune.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/88658627851.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/3f07618b43efd02e9b4463e23fd13972/vodekosadigebuxamixilusag.pdfIn PDF document text
    • https://mollis.rs/files/kapisozip.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/69487389965.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629e108e61---63083663362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=keygen+autocad+2018PDF 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_off0000b89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89F 19932 bytes
SHA-256: 631530e7fddbfa8344f338ff17269de713c908cdebb93641c341ccb1a10c571d
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10844 bytes
SHA-256: 301308c5b9f8187b92c987c968dc1f89afa929ff49b26b4bc5cf0cfd54b0e1d2
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1