Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fd9307458fc428…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 21:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01671636e770f800a078ff9855aa7a8b SHA-1: a29347353591c92e2f996c95cdbcb634f0a9d4ec SHA-256: 05fd9307458fc428e94fb8b893a238e49fcb85fb2d0081f4442c8f26652393c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=watch+after+movie+2019+online PDF link annotation
    • http://canshu.dlzj.net/upload/files/20210917184607970415.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9698de42---58592579185.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31238456448.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/61746134877.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/nonemi.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/54965598603.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/zadedifeg.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/19365037723.pdfIn PDF document text
    • http://guchen.ru/d/files/kujenofogesaxitulunarite.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/kaxarigofidirejufa.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/52408655718.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/61051409621.pdfIn PDF document text
    • https://zhansq.cn/upload/file/maxar.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/tobejezukeposudeb.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/77578349372.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/p60q5drei6opitc81h3m94v8lo/15898918358.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/suziz.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/kabugafabajap.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/12444917012.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/46217090388.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/winoxe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bad2f3f788---80262129907.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/40814854653.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210913171212.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/xaboforugawijodogit.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/28293868620.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_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 14496 bytes
SHA-256: 50e73b7e4a3e39f83dfad63300b0be1547c1474d1cfc8796ee7d4ba502a7ded0
font_01_sfnt_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 10956 bytes
SHA-256: 0bbbb21ca0bff3470fbe155c6515d81dd4bfd1649ec407ab922bbcee73a8e63f
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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