Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0d429434cbd05c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 09:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99908e5723316d05a7cf8dcd1f778bdb SHA-1: 51dcacd2352336ede00a5f592d462b1832cae445 SHA-256: 5b0d429434cbd05c75f2ae7ea007f31ae4f2f1a70cd4852bfeeacb54f81e6d1b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads. The presence of embedded URLs and the nature of the linked content point towards a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://driver-jazda.pl/upload/file/relilesale.pdf In PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/sefarajug.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/35794249181.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/ruvunogojefesavaf.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_124941.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/niwajagevavakewela.pdfPDF link annotation
    • https://kristinanamaste.eu/files/medavexunokisem.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f3f15f994ebc270e9d3e14b3fd002308/taram.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/2909510429.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vivinelewute.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/titivurekamokamo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907024401593242.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/20767456797.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4005d53a---74273801638.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/sadetu.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/25590818941.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901143539.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wususuja.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d69cac1e---97176021420.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/sutilidagiwiv.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/56301760241.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/78776082208.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/xufufurun.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ribuxuzizisogevawalekub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gamezop+apk+latest+version+downloadPDF 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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 10896 bytes
SHA-256: f3da649330baecb697bd9fd2517ceb430a37451c2ed261497375bd156c96b267
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 18620 bytes
SHA-256: 6ea6c6da02de6463016393e09422603fc42e6b01d0fa543eb39080f1e3609ea2
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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