Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cb781dc66bf090…

MALICIOUS

PDF

81.2 KB Created: 2021-08-23 17:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d83d962828ddfcf5d27ae09d6f62b8f8 SHA-1: 6e1ae2fb5c6772fdfae34e071c8ab31bcf171333 SHA-256: b0cb781dc66bf0905a8ee5aedbdb02f1e11c214a905ba7bf6edf78f4db3a7a2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The presence of multiple external URIs and link farm characteristics indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bafiti.com/sklep/userfiles/file/pimimomo.pdf In PDF document text
    • https://peilimineko.com/userfiles/file/tewimixovoreke.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/xosowis.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b59ea5e9---74455529414.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/82479651443.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/19791799454.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/wodamexetoloxatafa.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6951238391.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac46c9be2---45281817876.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaac37c04c---74557097166.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/60371803533.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/156ea39a9e0c2bfd5e747916371e3d1e/bivudika.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1561e3c5b2ae2460030173a699e7d0b8/puzufageg.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ubdr97qonhdkk6pop20bgvsi8f/83409426439.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecc0fa4f76---3972813174.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/gilesanuwenuxowax.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b8955cad7302ec09eae67d9697022209/mizobeveduzelexuvuwefize.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/18432002488.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/82548158731.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fakafugezenizagutumamuto.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/togatomipowif.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/ziponanojipepi.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/loripofoxowazatib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=inserting+a+pdf+file+into+a+word+documentPDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 11100 bytes
SHA-256: f9e4daf74292db080f5111db7acd7009d27aca9a5998c9f48bc5ef7293db11e9
font_02_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 16000 bytes
SHA-256: 7540f8e5a77d656a4550faa0e96ce3a3b92221a81d16a5f10073548ed9f58b6c

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