Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ca8ad3222835af…

MALICIOUS

PDF

95.2 KB Created: 2021-08-03 14:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 708962b34e747b273f8df56d2f8f2996 SHA-1: c158220537c3001961eb8b8b3bea02d3400db84c SHA-256: e4ca8ad3222835aff162e2a24864b0f3bf0115adb0adc59fd2fa75616c2be87d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to various URLs, some of which are hosted on compromised WordPress sites, under the guise of providing desirable content like software cracks. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests that the document may instruct users to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=autodesk+inventor+2013+crack+free+download PDF link annotation
    • http://eviljoy.com/UserFiles/File/59936806897.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2efb1c83---zozaretefaziwuz.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/de35c8008ae8dd08857fc00967756fc1/xetepezusalaberudabujomok.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601141141590342.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a144aa7a288---woxisigipogexobo.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/34351439865.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d234b0ea663---36851240222.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748691da40b---tuzevisudoladesamozu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f9d4eae6b---57303567796.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210728/file/1627458935.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f28641f2c7545a10750faf775565617e/genesunam.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/melaxuruna.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad29706e---sopubazefovol.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/pujadeluxonofofo.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/11220163973.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/7146830766.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/71838966038.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160affb4416f98---xagowanajixaviwivujo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210629195155_394433308.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/151d3b7085c82eb72b42ef839734e45b/97314669005.pdfIn PDF document text
    • http://agavietnam.com/img/files/pewadulibiniveg.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/tugifuran.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733bed4a320---31800123810.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705cc3d4dfd---33968963913.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_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 11260 bytes
SHA-256: 68d799c284b9d244138bc552e37d11b20452aafe9bd53261cf0474af53fc57ba
font_02_sfnt_off00013f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 18188 bytes
SHA-256: b23cc9e36e687146bbb4947ded1b0490b07383dd213885b91af98cd7ce3da389

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