Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7345d3ef51675c6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 10:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea852c1f44c8cb4f1eb7281ae977a7e8 SHA-1: ea72cad255b9c34e4d24d221c77e2dd960cf60de SHA-256: f7345d3ef51675c6fcda75cb23d9ebe05ff3d592732731826e1afb7b151f3700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the file's role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=lingua+latina+hans+orberg+pdf PDF link annotation
    • http://hosungtour.net/FileData/ckfinder/files/20210910_11555424D8D601A8.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/52655765088.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/61156509663.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vugosixuvujefibalefamer.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/tabojexejuzoxebojofigoka.pdfIn PDF document text
    • http://airmon.hu/images/files/96936933114.pdfIn PDF document text
    • https://luminex.pl/upload/file/bakeze.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tevojo.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/famutibupapugup.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/jobaxovibukan.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/95819028402.pdfIn PDF document text
    • http://falconltd.pl/cache/file/xilorakugakukexibose.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fisimevatogesofafezesuj.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/85306538046.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c9ad2b7---68760776414.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/6824678071.pdfIn PDF document text
    • http://sushi-belovo.ru/files/45116174299.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/repemeguzijodufanug.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/17364240093.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7196acf78---22000939881.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/dunazegugeredibepide.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/58893456433.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901192418.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b7b0420d---lobedetuzojisekulo.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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 15884 bytes
SHA-256: 545d953e5e925fff94f237fe63574d419003ed897765a7370172049eba3df28d
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10972 bytes
SHA-256: 6967c70cd969829b98f4d013f2eb17e4105ef3180c579559b89ba448bb7026ec

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