Malicious PDF — malware analysis report

Static analysis result for SHA-256 8660efe626b58844…

MALICIOUS

PDF

75.2 KB Created: 2021-08-05 15:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3cc10a45a1ae7bbf36af33441226bd6 SHA-1: 5faff34ffd2e0d9be394a953144df4a094f8f01f SHA-256: 8660efe626b58844775105227dec65544953b1c40b421cd1288c997fa9c369a0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirector. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using disposable hosting for these links, likely to distribute further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d53555ca1fba7923983c64e343991b23/vedetakobojofobidag.pdf In PDF document text
    • http://bwc.lt/i/4803448487.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4740109eaee011990b8390ad8c753990/70982323026.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160726ebb94a77---goxox.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463891cf1f---64339956323.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/sokekaxefiviru.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/11288960250.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/beacada1e4e08b42f63139d3f8ef8dd0/55715440139.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xezubesuvevi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b34b6fe0d32---rijomolim.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6d1b3b39---mivolinuvewate.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/jupixomezamukadepafezut.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/3292436c71d87e3d955ea7a0efd9a876/5009433191.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6f0b046f---laverepimatax.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/9274499924.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9e774804af012026bf7366224194f891/73937152940.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7feb3a84---80279473683.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a61aada3a.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4690fac6c2---56616069445.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pibapepabivilagawobu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/97360493953.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/55585412128.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/96065798814.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/17016847119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=animal+farm+chapter+1-5+questions+and+answersPDF link annotation
    • 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_off0000c13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 16552 bytes
SHA-256: 6ec2354ed1c446c4f667c36d0d93ff65937654309a8c2f8b57235c5c152c3c6e
font_02_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11420 bytes
SHA-256: e7a2a19eb8d6f7427943f13e2021c1578f029270d4fdb75e2ed009227ddc81a0

Open this report in the interactive analyzer, or submit your own file for analysis.