Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2da37cf20e3162c…

MALICIOUS

PDF

74.3 KB Created: 2021-10-05 08:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a83e1c8ee708abbb0a7db32634b185f SHA-1: a3d439cf096a55c4cd3f1ca2cf3a710a1b204702 SHA-256: a2da37cf20e3162c5819c5a45ed7d5959cc7ba40d3a233fba154e7e7ab066303
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=powerful+questions+for+coaches+and+mentors PDF link annotation
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/95383024447.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143e0a0141bc---8913910894.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d65d0579ba2d074ba1948b4e8a77e7c0/90070696229.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/fifonowalimu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/watarari.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/81354087651.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jatel.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/numakebuluzo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613181d9f0738---43410714717.pdfIn PDF document text
    • https://successalpha.team/upload/files/nugitimoxolanew.pdfIn PDF document text
    • http://teifsepahan.com/files/file/guseno.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/21770964697.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/mepakerijejiwejub.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/8486194118.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/440e7b1f0f92d2bee7ae8ce5b1ba2f07/zofimezota.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/4894445233.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19163813347.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/24835998755.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/17656924732.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/loberugesepagomone.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/76001447731.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161483d1233ba3---36513890507.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_off0000c022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC022 11076 bytes
SHA-256: f63ee4b2bd99504abc1de26ed11e52603574eecb35b483ab6c0ba211a651a0b7
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16344 bytes
SHA-256: 3dfa68839eb1f7ebfce1110c7fd11a61db63083f8d35d164e91595b8a9b2e920
font_02_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1