Malicious PDF — malware analysis report

Static analysis result for SHA-256 27aa1dee82fc92a8…

MALICIOUS

PDF

78.0 KB Created: 2021-08-01 11:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41407428188bc4a23e57a115cf5f1d4c SHA-1: dd2c66ce221d2bab63159be0058979fdca8113b1 SHA-256: 27aa1dee82fc92a8f8bbdf2c1d2d31683a8852d73f2525ab35b476128732d9f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malware. The presence of external URIs and compromised CMS upload links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0dc70f190---febetipimi.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609256282910b---77179702872.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/13049110318.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610277302902c---magune.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/wavamolopidupebegib.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/balilikogumoxuxigusexa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/87d7ad4d412fffe7d4563a0ddac7c4be/35696106309.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1f9e8bcb6---kalutekemuluxo.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/tufetoxoxuxurisu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/59410618eb1a2a824bdc04ded63a410d/gefemufulid.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/mitufaloforemezuzozokorip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d5735da1---65277030077.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/nujifufuxiwawumesar.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607068fd7d3a6---mumesejebuduvosemijuzawep.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403f04cf6d---fipozojodurexa.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xewanixonok.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075329880a9f---boluponodalorawu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/jedij.pdfIn PDF document text
    • https://bachson.net/upload/file/dawuvabos.pdfIn PDF document text
    • http://unsersohn.ch/images/file/bitesarifexepemujosorova.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6567d62d93---lorusiv.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b5cb8a275892e44687c35118c9abede/67910809211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+de+espa%C3%B1ol+para+tercer+grado+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 16528 bytes
SHA-256: aed60189120a484f4d1601aafe60354ebecdc44ea8d0c942fd4d647f390fd56b
font_03_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 11012 bytes
SHA-256: 8ef342a80588f09c9e58748efca1f26517b88ae5e5017b4a223029619fe3ee35

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