Malicious PDF — malware analysis report

Static analysis result for SHA-256 169d48d920a7221e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 16:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0b0ae8a4afdd370bea5f0a3efeaa920 SHA-1: 53b0c0d2c81ab9b198e158e3cebe6bfe4b173235 SHA-256: 169d48d920a7221e7c42df2da4b60057e99818b5dd799b5e65f4dd08ceb0d155
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

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://chcial.ru/uplcv?utm_term=gif+camera+android PDF link annotation
    • https://repare-ton-smartphone.com/userfiles/file/3217944545.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gixowezuzo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divivanidebip.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75291572235.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191101041.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wilununovimu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/53ad9ee5264ed4e6437d65f94da35562/riwirajukip.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa415ecf0---71648020698.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/95870486803.pdfIn PDF document text
    • http://rcot.by/pics/files/bajazimomonegomusulamumu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210901101532127.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/7290319085.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/luvagisisu.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/33882687087.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/wajujubadonasiz.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/46582890610.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/70621045289.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b3d69d37bab835bcfbf483488649cc34/72856399555.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xututiwar.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681b88cf29---niregagezemepazur.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/74060784020.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/90097778618.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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 10364 bytes
SHA-256: 35b905674e23e795588824a83adcdd16087b0933ae6133b27a952ba8fd953396
font_01_sfnt_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17148 bytes
SHA-256: 8778f8e351de5490a14afc301e5cdb1dbdf612753a07cf4cf35ccc80a9cba450