Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa76e29a3ccd067…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 08:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f8da08b4a62f6f5ccbae106ad9db58b SHA-1: 0f5a6b85894cf692969fa18f3f3ffbfec3e72997 SHA-256: ffa76e29a3ccd06796a8e1abed4e562018599af614cd6e7828478d6c3cb66c5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=the+church+is+one+body PDF link annotation
    • https://perfecthospitals.com/ckfinder/userfiles/files/bugamizakerupo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ppv1j1tcg6cqn8269aou76ul1f/sodaduwodejo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/84625396563.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/2f1376fbf429c9af4ff954670165ed08/regedepasomirasat.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fa5b6f284c5bfb9d17777c64dc05526b/roxizemojiledogafolejun.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b429667fc---99351916528.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/70530823565.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/34442554777.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/nogopurawuboparej.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/20006694938.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/98639126455.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96316793a---26311472966.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/wobofowosilajik.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/32461037444.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/143787357460fb8f4fbb94f.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/fudikidagaxoguxun.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/ligegilefamodetur.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wukatimowilogabodagoxad.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/pegexelaliwodad.pdfIn PDF document text
    • http://cmtsport.com/pliki/vapewik.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s6or291k4aejp8j0n7nbqftj2t/gumix.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/turirewirakoderit.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/pizoresetajavuvude.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 17648 bytes
SHA-256: a57f50cb686c5ee46e73e0d8a83d98a29655009a498dd6355ebcf392ad948b81
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 10476 bytes
SHA-256: cb4d665316618df5ca37d20add2489c7dfab926199c50473a2b045ac7aec48bc

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