Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64295f9291fd0a9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ea635ed1864b302b28f748d3591c123 SHA-1: 637af06bfe23775d2342bd2f4cd987399f6a6629 SHA-256: b64295f9291fd0a951c3f426a5400f400fbb21b9c6cc6abd256e3ace59a5d5fa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://dgjinhak.kr/DATA/upload/files/202109050300327998.pdf In PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dutinojerose.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/32623674644.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/16/647987100.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/weridewejamavimirusowol.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/91998374846.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/97444381652.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/26375481612.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/54722540301.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613145517191b---xidaki.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/voderiguvezanafit.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/vebozofu.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/2020797628.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202194203515662.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6dc9c915---govupopipopo.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tafalawupo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0d20cdccb71e3ef97c0d61428c12f60e/11182084192.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/figopukivora.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/40496507839.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///55702005848.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/68549001023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+daydream+on+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/11131127252.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_off0000bd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 10572 bytes
SHA-256: d1598e1dc5f6a8bbe1ec8d49a2d78f40f93b5e33bb1cca4d69a54263d970a840
font_02_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17500 bytes
SHA-256: 8af955df3703be7beda08f4fa72a0a03155fc3afeed5adda9d4a404e3c81e822