Malicious PDF — malware analysis report

Static analysis result for SHA-256 159c3fdee7ea3342…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 00:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b346f91f551197d9d7482941e0effe5 SHA-1: 1e57d52fb2ea7d9794561dde8977a3796909a46a SHA-256: 159c3fdee7ea3342fab68b2b843f6b2ca5f8b8a6892728f15d078ad19c7da6d6
156 Risk Score

Malware Insights

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

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous external links, including a link farm on disposable hosting and a link to a compromised WordPress upload. These links likely serve as lures to phishing sites or malware downloaders, indicating a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=download+emulator+nintendo+ds+untuk+android PDF link annotation
    • http://owv-sad.de/userfiles/files/8105631164.pdfIn PDF document text
    • http://honda-vo.com/upload/file/fadexibagulupav.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/tokodubetaru.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/vuduvolivuf.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/94303670167.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/kodimowukotibifuloladerot.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/28040628920.pdfIn PDF document text
    • http://inercial.es/uploads/files/97919399425.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/konojinojokew.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/wajimugekinokajitejikala.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/89497429712.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/aeb569552aabddc530faafdbf704f5f5/xijovamubugimesom.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/15657532439.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/92983361295.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/55be64f97291a5282f6e634ed5139080/86118408302.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/tapobuzivididu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/86821151770.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b475e50ada---laxuxir.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/40702036476.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73470311527b00dc1b48d8508ba548af/buwebizivula.pdfIn PDF document text
    • http://wawa757.com/uploads/files/53059111429.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dunakabelibemame.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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 17312 bytes
SHA-256: 8e7a012f0b81a403ca853b12e6d3a9336bc9589342967dc6272bfed6237c85b8
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 10688 bytes
SHA-256: 3313ae8f26c9cb071a87689992d0b6011745f515188d516d4d63daf395254614