Malicious PDF — malware analysis report

Static analysis result for SHA-256 1195efe6427b5010…

MALICIOUS

PDF

91.9 KB Created: 2021-10-04 13:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84c3f2601f15641822ca1ef0968e4376 SHA-1: 0b3b111a4a81d17ecc5aa2dfc40d5b07094d025e SHA-256: 1195efe6427b501026087fca6954c61a38a50a4aa9dacd04a5d76e00b5d0b250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised or disposable hosting suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=rendered+perspective+drawing PDF link annotation
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18d3531036281898e1fd80b059aff968/kimid.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/12542667580.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/58504185396.pdfIn PDF document text
    • http://home-plast.ru/foto/files/1209914442.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/16/file/20210916_005145_149.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2abacf4b9---guliduwojajo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/guxuwatoxibixatazuseru.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/goxopunexesosujenigo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8b51eb73---wawelakivufegule.pdfIn PDF document text
    • http://zamaro.info/images/fcke_files/file/wuzowax.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/12776872407.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4ba08b450d7bf58a016ee766bc5e4ea2/42367362436.pdfIn PDF document text
    • http://kleiberit.ru/files/file/6022643942.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/weketakug.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/vadejinefafifabesawas.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/191130314550.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/60582009234.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/51135369440.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/73796464316.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/nevasenavivobaginido.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/begokufikesexusu.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/96963246493.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6fbefc9ada1864dc194197f226121628/daboz.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/pojizar.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_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10720 bytes
SHA-256: 0f425d11e13fd18e7b53cc8dfe968449ff77ea10ca9d66676e46ddc157b41634
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 19456 bytes
SHA-256: 0ca20627b8b293a7f7f5f503264d47b47b48ccd0ad763feaffc9558c9be845bf