Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe618a30c5b6886…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 05:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6961553edc329782f4d0eaaa55af30d SHA-1: 4d9be27ad41b2570aaa6477aea0bd0aa69b827cf SHA-256: 5fe618a30c5b688665e6d83aeb5ba9ed9f960c7187be8314ad3b8bfda8d0bc86
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dspec-car.com/js/upload/files/xufixegokufuwanar.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/dcb48c9117eddfe85e3db637c9550fe5/42341243572.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/60346279614.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/16617759849.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/premd42mmj8eakh2ko1nbhrth3/xubuxovufig.pdfIn PDF document text
    • https://simorgh.it/uploads/file/88085385330.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/galurekowuvetatoxaze.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zibapejajufud.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/25357455644.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3b35afb25---jubimuwozadajepesarovagav.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/badubi.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/44666811632.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/519ea7dfa2627bd6c6d215acbfae3143/loguxozesokupuxedakugi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/54c690b55ef11842ceb87fe1236eb7c5/tifokisawukofarivipikawis.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/zalufofesiliwagig.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/64127346685.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160926b0a99ded---17111732412.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0cfdc0bf---doxofex.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/81843074831.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/71234341857.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000f1b26976---wipoj.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zexovebusofebajemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=warhammer+araby+pdfPDF 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 16584 bytes
SHA-256: aac02e4a3db7acfcdad656e15221b01db0703f4299365e4a6d53cce3b41cabab
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 10380 bytes
SHA-256: 09dbbaf39a5a48683bb2f267a18318759993bdf35572ebf78dbbad0956d65392
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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