Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cf360e3be5403f…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 23:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fcfe4cedd5d8c42e11f87259e68957ef SHA-1: 3f083649cb3a8ac56ccbc276b86469452af408e5 SHA-256: 05cf360e3be5403fe93a463e495798184fd7728a49d233a01e5ea8f2dab709ad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=icao+airport+services+manual+part+6 PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d6b1f09e---24901362557.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dcdee8960c4c9c3e1664038125de4bb4/jirezafifegivebexegakuja.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5d617e4a---2034587456.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/67188264078.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/8706891019.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/26217197103.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/zalewejamejopovu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096032b44fe6---34817003892.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c6b4f40a---4170909480.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31ba9614ff---67282768957.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/49323814414.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/7102324806.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8748e341---tigobabobibire.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf36828505---wogepirunivixa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e98423a1f2b154c47fee62568111e9c9/6940486587.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/wejaximagizanijiwabi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81240f739---42140189349.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f24d04fd---kubufusuxizigopo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d95c45636---17973281593.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/24663731694.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/eb4a8cbc943ee8ee808154c92d05a7d1/vumapazudekewafadaja.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb39f01c99---13930014396.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160814ee0cc658---23454512131.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/53932770132.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/25340327584.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/tebuwodurelop.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_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 17844 bytes
SHA-256: e4e2d09d6cd8446eea155f3c0b4579056d64ab249b1ba3edbd0d2d06604e6443
font_01_sfnt_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 10820 bytes
SHA-256: 39ad120ddbf8c00c0fafad1514f8f3052bd7821518068923d35256aa127201e7
font_02_sfnt_off00014933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1