Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f57cd0f4796891…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 23:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd02d16a1f56067b5ad76a357599a498 SHA-1: 9f0377f5039c99bfcaed6acdef6cd1083ffbd6ee SHA-256: d6f57cd0f4796891643487bd5b95f12dbf247a4682533d14b661d3decbce0ffe
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a link farm with UTM parameters further supports the theory of a targeted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=text+appeal+for+guys+pdf PDF link annotation
    • http://liebherr-tr.com/userfiles/file/forus.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f111dd5a---fopuzazozobatax.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/45871441511.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/puviwanobipe.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wekokuduzuruwagakubulas.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/45915167956.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d18d1473---87345000896.pdfIn PDF document text
    • http://yuha.be/_files/file/lomokavo.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/34562cacee32b5b1f0f4819eb48fe3ca/30248029781.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/kosifumesirigozesekorago.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/kl0rlu3rb9ot1ihmg6881lqne2/juvipanodubemigotev.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57723535877.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/16514008511.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hl9saevdeij2fc5bq7996j4hkg/rilisigemexisijonikew.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50e2da65b---20576178269.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/megewabum.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/94600572737.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kiferalowodonokosolam.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/04fe0a59b41f4d2a2319dd502b895ec7/botekunopu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9375c8ff1---vukageredudazofek.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/002ae1270dff9dcc6c4bd378fb730bed/5601581340.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d8823d819921603e5761008a2d75b00/30266057671.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607997a912645---14731655553.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c658b63b883---21404047097.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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 10756 bytes
SHA-256: 4f9af7801d82a10f8c8587b3264c178565e185dda049a47f3a43aca0d53a5bca
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 15536 bytes
SHA-256: 19b3f5e5d8960dc3fdb041b8e9cc46bdbc9e2836dc946b1cb507701fbeb75717

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