Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff0d511316b4c06…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 631c2f205c6769eaff32f0902b4dbeb4 SHA-1: 3d93dbce4dbc38c2f002c5126a7df3b421bc2528 SHA-256: 2ff0d511316b4c068922fe6dd8cd7b8cce8a80879f59f79959317a36ac4a403e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely intent to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://irlanc.ru/uplcv?utm_term=overbite+and+crowded+teeth PDF link annotation
    • https://aiaciran.org/cache/fck_files/file/17616758211.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nubaxijovazamixori.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d384ddf881---vilokonaxobumikit.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/taxinixep.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/424005dc893aa8ba80741d401d09675b/57013850574.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/vurizasoxapotetofasipo.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/tawulutexawose.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f04c765be8---fumuv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/62510774112.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wipepitozusizabag.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b8505b969208ede7ec2c165f0770ae4f/mazexewikiguvale.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717820e02a1---mixepelokuso.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/beliba.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/vumisijifesivarok.pdfIn PDF document text
    • https://tarsiman.ee/files/file/96233418780.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609224dab573e---jitanaxopixaj.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ta8sqh57flspch1040d60utpev/wamemotimox.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/zoguwewabamoboruxuv.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/92269297823.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078975164bb0---58671850150.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cda17bac0---lawosisusetu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16070b066ee156---dosiradofujenasalo.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/11590076851.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d14292362---42162294191.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/bepeki.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/93870925926.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_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 10572 bytes
SHA-256: 5b9a366a133db42fa09fc176bd412a5a4564d68be651750d40e31009e068dc3b
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 17852 bytes
SHA-256: c988d46063062c5be9f1694e1d22580a0aeaf808b11ae9ff7ab37c39fcba003e

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