Malicious PDF — malware analysis report

Static analysis result for SHA-256 15671eb580109fde…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 03:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 787c1dd36bd4bc56587af1bb7a40f46c SHA-1: 61b199266a23c0af81b18fa03a99a79785f91aa7 SHA-256: 15671eb580109fde75509f57f70dc7c5ecb11134c0f3b7447748066f48019abf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised content management systems, increasing the likelihood of a sophisticated attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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=meaning+of+complement+and+compliment PDF link annotation
    • http://pcwenhua.com/uploadimg/file/16245635172097784367.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/12a866415e15f871d3f05445cc4b7a37/levevobadojedalamowetur.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b05677d4fe8---lumigifevedezubufeke.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/10086535152.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/65dc72ee4d9e661e3d6a059a07818ed9/39603109368.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608910adb646c---dopekiriwipon.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/74240156917.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/piwoxukositu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/11771570440.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba4f0b8ec---38855991447.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/biforebixedup.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/685fdb7b6e8d7a1ba66eb37e623afa0a/sopob.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8an1fdjet0c9h537fa5qa0s880/36229638748.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/foif3c93s0u57kg6obaakmsgp1/gadadubazesegikixe.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/zozuzivigafeluraxilepez.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/60335129635.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3408c49705---22795565616.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ce0500eeca74c64e54f4d5b98d5ab8c9/58705650258.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///todifenuxe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e9ceb06c7f851ce5d61682713790d995/xonevaleneve.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/23q8a55q5j68215jpjeo5jv253/45851426402.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/51299692898.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/68048053250.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 16996 bytes
SHA-256: bfc62a89b27dab66a22d1598659ef23948fdf4db98dad49694c2bfed744de1b2
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 10688 bytes
SHA-256: dcfaecfab9197fa0e7e02e553e3530ed4853c56eae3b6666a90018e75174c681

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