Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4187058ff9e3f33…

MALICIOUS

PDF

79.2 KB Created: 2021-08-18 07:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e503b68b0c1d221a5cb86d3c60729df4 SHA-1: 5e216515360eeee852363d4913a5dfa219742f39 SHA-256: e4187058ff9e3f336fb5a72a27780622a9023bb1cdcd7f678012938a57921e9b
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 0.9846

Heuristics 7

  • 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.
  • 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://behbehaniprojects.com/uploads/files/birokewi.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rtc5vijat3tu0dnh8hvtkn20t2/44608141376.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdff08a28---fesenenapax.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607317b6afc6a---pulojoziz.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/xupolimuluxaben.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/mexesugi.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/88138309949.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/konolesaf.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/40203538263.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7fd62a1b---bilelesofoxovuvodod.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6336e859---93886005851.pdfIn PDF document text
    • http://temple.mo/userfiles/file/losufuvawuju.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/benopepevufupelam.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/95267985129.pdfIn PDF document text
    • https://kimansion.com/uploads/file/92589071267.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070f47de16c4---69740361629.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7771e1966e---72825735694.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210728105945.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4d643bc3---femaveridowe.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d545f2dc4---43048668669.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6deb52684---bajuwuwe.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/71293952619.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b435a88022e---25060281260.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608358114ce28---6081352640.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/bafokezojedesivo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4c82e237aeda22535bc71dc4c41736f9/1295222277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=actividad+integradora+modulo+4+semana+1+prepa+en+lineaPDF 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_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 18108 bytes
SHA-256: 31d5b60051a186ede23c6a95f1a58f36e6ae6d95df7db335a18c75f1abe83b70
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 11132 bytes
SHA-256: 8ef65afd00d937ed186b4a3518f69da6360614fe7c9de8f2a723522c6e5114b7