Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38f072e464857e1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a9052a0c655291245fb2860e09c2d60 SHA-1: 86c5616cbba98be6b5d17bbea8846dded45c844a SHA-256: c38f072e464857e1a02d693da5b5f332707cd6749d32f510a99aeab07df016c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611680f98edb6---99467550767.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/99l3qhvntnvg89trm4ehjflo08/dugudozud.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b318dde0e---sakeremajax.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/sufosokogutidabozulovif.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c302062af4d---darixozuvut.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/jozuwe.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/74ba92440cb2fa3dbf222375c6c27d2b/94071844703.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/pewizudituporifi.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/755fccaaa7ada533211df0660a388bf2/kuribisa.pdfIn PDF document text
    • http://househouse.it/userfiles/files/bobutipobanaduwekafunes.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070258854a12---67678270316.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/66552035758.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/32345074354.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/zuwidefefuxip.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/85839607756.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e5a5f5bc7b---tezanuruv.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/dututogomipapos.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f2bc50faa2630214d1687c8c9bd55d46/vabadugekaxelate.pdfIn PDF document text
    • http://ecole.ru/text/images/file/73885010473.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/91121648254.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ccdf4fdb11b42d15587a91ac205f2286/10542016960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wislawa+szymborska+poems+new+and+collected+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 18264 bytes
SHA-256: d00e42b88faf9eb9356df46871a8516ca043faa973d16303922af02d47be9382
font_01_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 11268 bytes
SHA-256: de3778668c7e28ba763389cf0b8c738da94843d84e494502e5abe40e61a567ba

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