Malicious PDF — malware analysis report

Static analysis result for SHA-256 e783db9ade2507cd…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cccd72aa4b6986683558ebd8a0c24f65 SHA-1: 3dce9176d1e4a23a0f4924bcc17845af36b9af96 SHA-256: e783db9ade2507cdf1098f77364e6cec216c49ab825a2fcb317285cd7f28c13c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=hassan+and+amir+relationship PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ff77c235c3866fb8cbdde87033f76384/25544751754.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c592e5e7c---kagazukumiferenuzegat.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/xajeruroxuzogivurekepezug.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dexuwajerebiterubawelized.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/81644922516.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26f53bbfc---48409329148.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zojotewaxurutodajituvubem.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wadapabubilodopilu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da9a25a89---sajakamaniwivifokujitesam.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/98065206331.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/58330596282.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800ccf2f03---rofuzadojobipe.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a984fd59d0---bixodekobotogixep.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe0458c82---75187407979.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b462aa3525---99977407046.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/92085116304.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc0709fc7---pabazokukikafekijalutaju.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/15225811671.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3af0264d10cec302a9bf9515d0aea8fe/36774097005.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ea2b13aa---najulavavakafevavaxufatuk.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/kilemi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/46991306497.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/fifij.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607429603ab26---45578048458.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/likomabasipokodewir.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_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 17000 bytes
SHA-256: 175ce1a05a87fbd9df9ae9c6336aa96fb42f5989229d11e1538e9195c9e23d23
font_01_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 10648 bytes
SHA-256: 7d0d891d0604ac5b920972710af4f326af838d9a65a186f9af13a5917f85d84d
font_02_sfnt_off000139f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1