Malicious PDF — malware analysis report

Static analysis result for SHA-256 920490a5f6adec42…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 21:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 370f31e78d8e2bd9c814555de23ccf50 SHA-1: 6be842ae8f957d97f58fa1eb832c7c0baae085d3 SHA-256: 920490a5f6adec42011cdff88bce483f536d030213996d925b75dba0e70947f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and link farms indicates a likely spearphishing attachment used to deliver a payload or lead to a phishing page.

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://crysiq.ru/uplcv?utm_term=video+status+apk PDF link annotation
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/67327792613.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/wazuviliwujibim.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/82625852055.pdfIn PDF document text
    • http://ingore.cn/upload/files/gamarafopix.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/33909606222.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/fivowev.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161424d614d0ed---mavegor.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/30217597650.pdfIn PDF document text
    • http://schokobrunnen.com/idata/44983813520.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/68565376787.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/nazexik.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bogatuwixuzaz.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/90492996616.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d71a44f1---pipileberub.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/tojimanaredixogiperulabif.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/46503398276.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/79088411852.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2047dd1fef914692c7125149cf850478/52290225721.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9680d6c8519aaff8be7e114289070633/wexavivugawot.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/belebujizigojebopipuzor.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/25582604588.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/budediwidegunafeb.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912194903.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/laloxozosinuja.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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 19424 bytes
SHA-256: 35b2e82985ac2bb391ac0a346f8638e5b42b5707b26dfe82dad27d6b0ec0946e
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10296 bytes
SHA-256: dd8eff2c1655bebe318f1fb347ac7dd937b026054ea8c5871a00e0b8fddb79fb
font_02_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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