Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e664bc54dbe4c7…

MALICIOUS

PDF

102.2 KB Created: 2021-06-18 12:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d4a2acc786ffbc7c6c6b8ac41781af4c SHA-1: 6e4273bc7edb3cfba47bce08a8206209c3fb317e SHA-256: 09e664bc54dbe4c7d993fccb2f40da9e4b6519b0eed4eefcd55d15a2a0c422be
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://krisoc.ru/uplcv?utm_term=12th+maths+book+volume+1+pdf+english+medium+download PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb766848d2---6423774688.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b076e7ab9---46225733464.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b267cd67---53763393312.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160965f770f564---gosexifigixarapola.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kj29gclfe45rg4ib6jtgi1mj2o/31204273681.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/96143551156.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d80e9cfd---vosudakok.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c6f0ca19403c6073b55a31acbecad9e9/mutefogozizuzuxogilipob.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tuun63povdk292eqghm7r14su7/11681085069.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/52ec8714bf06dada66fd33a5d46573ab/pajirijuzepobidigajevadox.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/rizuvu.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/81334190050.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9e2e25d3800207cb8048dde9d3f50066/nagadijigizekenene.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3664bb2d4543351420b64b4b88b41973/66022937923.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/71599229027.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/j225kam9gc06jpgqbjcc7i37a7/36575902272.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/vopemixaresebalomif.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608770fd717bf---54268642922.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/moronaje.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/20797734965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 5804 bytes
SHA-256: 2b17427776c7c6054a6b241007fd68cd42fde88b1f66a44fc6ae8f07988f904e
font_01_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 20816 bytes
SHA-256: b7baf0bee1fee38b56a76a66e9b1145d20dbf4f2e136d82f58e62f3760e65388
font_02_sfnt_off00014ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBD 11144 bytes
SHA-256: 14a360da88e9fd03a29a5a47d9eec9836d89002224d84d422f45d4f4c3340d00
font_03_sfnt_off000174ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EA 16164 bytes
SHA-256: 00c0e8a54a8f74e2fa2818f819807489b4f7a0b26c5bfe001a0686f805d0b2df

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