Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa2f17a824c3cff…

MALICIOUS

PDF

85.6 KB Created: 2021-10-06 21:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d004d38dfecda7b8df7a15a6735de8dc SHA-1: d6ead0873491ff1d91d7c415c6e9f47cd04de9bd SHA-256: 7fa2f17a824c3cffa249c6ccbdb54f8897fe25761d09a8971aa150a541cc355d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document contains numerous embedded URLs that form a link farm, pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=answering+questions+in+complete+sentences+worksheet+pdf PDF link annotation
    • http://duythuc-bearing.vn/uploads/userfiles/file/nudufadanosudoseti.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tinajimut.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/64001247946.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/22a79253f33fcc959d5f6d095e365228/46174559453.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/50165691514.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/puralevuwurutaso.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/wadawunapi.pdfIn PDF document text
    • https://x-software.cz/data/file/bozanadavavu.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/59898014227.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/64394563366.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/80690455944.pdfIn PDF document text
    • http://chipgene.com/image/files/20211005_234449.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/14847644952.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/86661730176.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/lopin.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/50109928498.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/negatepifakufifonefabij.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/rejenipigina.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/24396442081.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jajujotamabesaboz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471c655ef07---pokunam.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161541c32ab11e---sadexejumafom.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/wewinamesejabubureditu.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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 18184 bytes
SHA-256: 94ea703dcf37dc37b1cd62c722b3ee08929ff983c2988f2493eb07300edec22c
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 11312 bytes
SHA-256: 2234986143b7b1810e2fa2a543d446d9046c9cf0f10ab546c23c513d391c562e