Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee74d5e61d5c6c4…

MALICIOUS

PDF

89.9 KB Created: 2021-07-04 04:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9b38c27ab2fa681f2287b01620541cff SHA-1: 1f40334a20f9a0494b8a9227a722476559c89e8f SHA-256: 1ee74d5e61d5c6c4b8f745d2c30e3111532cc8352a1ef5f2ab0d3fd200a0f0c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through phishing or by serving further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=purpose+of+degreaser PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc381636c---66562607062.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/822af48b4a7e3710140e2dadcf075167/7783565778.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/jifimonilafamu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbb78ff22---gezedo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de222e82fdb---69436647153.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ee007b2b---fujiwono.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/96dd34391eb2151a2028c03ca7eebff5/meguz.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda03ea3d9---tiwoxasik.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/00e4499a786ef802f6a7cc3eb6c926db/13073111463.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/zurumobepoga.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8ce226da27---koxagojagoluzedojunivow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0978792c---6113361829.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/29420902192.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/67677617325.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hhp6dvtcl47l2elkued8gt8dr4/8958593934.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735abd0c4f---mesorezikak.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ad062fa2---67269979807.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/mexiradabuxa.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/47721246807.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073037852ca3---napelonatamibudor.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/5338245124.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b634d749d90---6434438056.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i614iqdoddeg24krvthdommdb1/poramovilubobiraduz.pdfIn PDF document text
    • https://emprenderem.cl/files/berid.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce95461e92---71644287704.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 17304 bytes
SHA-256: 51bd861de2c3cdf7ee31f79c7bc998248f341fedda7682cd8c10bf99d083bc91
font_02_sfnt_off000142ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FF 10432 bytes
SHA-256: 18581536fdb775290407ff5c521055b5310241f8627659ce1be89864c64f6e18