Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c73690da97c06c9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 09:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0308d882f48e4643f352e7825540a276 SHA-1: aa456a4744e5b3328ba81e34c933b3556f01de67 SHA-256: 6c73690da97c06c9a45309a9a5dff09885bff7afbe4f120b6f0f1d7fb837f66b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+change+location+android PDF link annotation
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/89362190913.pdfIn PDF document text
    • http://kvrhousing.com/uploads/zigulowojonomosevufe.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/25522299828.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/15875248387.pdfIn PDF document text
    • http://hkalc.com/userfiles/65170927999.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/89027367455.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/50243390739.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/noboxilixekigu.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/96098690786.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c123179f0---29173234036.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/229474299.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/falulexisofupaj.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/53530966069.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4b33ecdf0406724798a9b6a5cf199fc9/jikukibop.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4sntlrml2cqceevrr510jeh4n7/dabodenonofezokozetesinam.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/36135957219.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/94792009759.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/84693899031.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/12125919875.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130515869dee---mumoraw.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138052089add---zomavijumuwibug.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/23583701138.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56707688107.pdfIn PDF document text
    • http://juentai.com/userfiles/files/zuvanekadakexar.pdfIn PDF document text
    • http://zuszdounky.cz/files/xobuluwugokogigisape.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210904153127.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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10560 bytes
SHA-256: 835a1f9e5c771c8160a1ca394ec33a92cffcc2ccf0a59503d93c7db0a721fd67
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 17256 bytes
SHA-256: ea102993efac828e9fde9b91c5008c94e029089ae72146404b760158fdbe9b8b
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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