Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf64aa1d78df8506…

MALICIOUS

PDF

87.8 KB Created: 2021-07-13 16:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d7349a63d6852ca29a898a675a3e4f8 SHA-1: b55a7d7e2fc2ad1a955e2b7a6b8d584a909ae871 SHA-256: cf64aa1d78df8506afe7503f87042e062f35e1d4eca738ab5d32d31b5105569b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution attempt. The file's structure and content indicate it's likely part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1f19b9f7---69334183479.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c436e4cb678---66464845934.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xesomom.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/25157376968.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/80310040037.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/d60gj18alptapqe6oksb5ba22f/nebukokutazosogi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/67982970353.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/vijeza.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/410cde255660779f6cb9f947ef3fd05e/xunopape.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/detiwarodosebijifatikoje.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wiwulopiromodotowupup.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fiwivogibafumuweguwa.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94363845019.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/47545426813.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/40888049505.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jtnkjk3csg97sm4d9vdeokq558/31687943666.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607975e7d03d7---82479608970.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/nuzepupanujoserufap.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081808fd59---karele.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/a9mr9l30ielio4v01j621ibrp4/vepomobovozuja.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ec2d658959cd46c227eaf3e111de6283/sojibet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cengel+property+tablesPDF 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_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 10620 bytes
SHA-256: 1dd51076fb92b9913fff27dbd993719a039d69bbb417c266eedaae1ee2d01b6b
font_01_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 16472 bytes
SHA-256: 9cc3d7ea0dbed688131615a251d192d16c3b66e41dd6c6789ad8e0396a9afd17
font_02_sfnt_off00013a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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