Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc73c619baf5ab52…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 13:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4498b43a39602092d0a91eb165cb2d6e SHA-1: 7ea4b957aaffa04e84784865dff1e7f7e8152577 SHA-256: fc73c619baf5ab522fddb2a01cc51c43010c375856a7194f7c71d997f495155a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary attack pattern appears to be directing users to potentially malicious or phishing-related content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://japan-railpass.info/images/blog/file/78206024566.pdf In PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/loxulevadamesewefiz.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/13306852761.pdfIn PDF document text
    • http://eternoohydro.com/d/files/85142397661.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lifatotanuziledorofutamoj.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210918/file/16319331624693.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210919_7D0AC5F60EEE9092.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vezazekekapo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d399f3896c2bdacf89342aaf46882e5b/repezeg.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/5037565976.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/zuposako.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/zipabuwebovirasiju.pdfIn PDF document text
    • https://orrizon.ru/images/file/sufobifanudovomoki.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fd730929f---vizegebuxoxivudogunuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2f940a4f---78877896418.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/temagimoxafewesivu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/tomokaxijevowefudinaj.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolakazejinegalof.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/nowej.pdfIn PDF document text
    • http://4bx.pl/public/file/vazarizimuwukema.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/zawesufaxuxewimepur.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133606c9a299---45941405501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=car+games+kannadaPDF 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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 18348 bytes
SHA-256: 2e8483ba56e15ba6da60eba82e59692790af1e97f7210519fec68dc47c79492c
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 10360 bytes
SHA-256: c8d3dd824126ebc3e8e47e1691e7aac2c811585c2f3b510bec6ce7139c9389b5
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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