Malicious PDF — malware analysis report

Static analysis result for SHA-256 049d18666ac698aa…

MALICIOUS

PDF

90.3 KB Created: 2021-06-09 11:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3ab918e69173d5fe6a76a0f4cd608790 SHA-1: 92c511da284e63c494444c2f100cad304ad5b5ac SHA-256: 049d18666ac698aac77a215ea548f19791fcb5552020da1925bf086a9798e743
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 0.9996

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://oniceh.ru/uplcv?utm_term=free+beat+sad PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/13p9elefm03kauc72utktoqrsn/bonarulevum.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2386305fa46b36288ad43e92374801ef/73648536768.pdfIn PDF document text
    • https://activepymes.com/pub/file/wubimekidasenevufodi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4637bacace---52211683333.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/kimegabonosugebe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657213a56b---lijakavevejaxitetita.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad1812f9c---bapabozuzosa.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d6091f1aecebac7362318d148e0fa3bc/rirenibelalubuni.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/5932035884.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/buzaba.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f83f6f8a1---rizivunibavosur.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc46ab5600---nozimabazete.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a964e810783---41504262211.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1574954590---94736096429.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b952ccc154---95064678429.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618e0941a7---depadutisubewojezat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 4880 bytes
SHA-256: 6e6e09a83a735de666ce9406b2e2388e0048b8be912acb68a4e9fc5d0932dc95
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 9372 bytes
SHA-256: 79cdaef6b0f1cc8c2e622888b91b8d85ed9273ac2015d229eb51474d33716872
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 11872 bytes
SHA-256: 38fac1c5b9b10c7c789a67a04f4a7c4291ac36b89c98b50e67db6b59567bd992
font_03_sfnt_off0001428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 17172 bytes
SHA-256: e58870e1eae2d841c27ad6788a48c669eb7c13230fa2abfff064cec43ad151d7

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