Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ae5e2e2db7554e…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 22:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e208c914400e704e17475ae3b995c5f1 SHA-1: f044f067612122f7f539e6fdc16f9e61a0d65825 SHA-256: c9ae5e2e2db7554e1350afd450205c58f96ba7a866894bb60803109e3489f09c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to click on malicious links within the document, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hodori247.com/uploads/files/tekuwopozuwewajidi.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aec93290775---56819722563.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3svluen8rn8lkmtc08ptfn8uhg/kimebo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438e1ebb53---2241958614.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/58420968773.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/tinofoduvedulat.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gelilepufitikusobufiwotuk.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/85dec5e51874887df6e4510425dadacf/sepujevenumotavuv.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/81571512935.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c905319c0b---sopitesilatagogumapetam.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d51b6c35f3c---639526653.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d5fce365---90176408668.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd171abeb4---tunemezigemisugijuzavakok.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4aa0de29---vugosozeterubon.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/85404251450.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/galuzadizewiriw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160916a38b9127---18950641229.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/88520588403.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/97367705213.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/tiforofidonidupimikavosa.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bqhqa6t8odu8vu8bcf0g18sq1o/21706226872.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aaa112e5c---70317077579.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4f320ei2sqltfon7imoufbrl6/xetogab.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c6cb233b7fedcffe46231d7ae0bdbb26/womilepaxezidulo.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/27307603003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+small+time+confidence+tricksterPDF 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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18316 bytes
SHA-256: 35d71b8064c8f11f5a51ae49766787879cc4bd7a98c642ce0a0fb1647335a5df
font_02_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 10708 bytes
SHA-256: 80f2fd809cf65f06c24bf878aad25f162790f64843ccffac38dcaf6b43f43d18