Malicious PDF — malware analysis report

Static analysis result for SHA-256 068fd5a3d42500c4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 23:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e667e94548f83c9be4c47f110b3dbb2d SHA-1: c5117e9004d02ce647b557f69095674f6c6becd8 SHA-256: 068fd5a3d42500c4829c47fa5bc93dd4cd0882e7f15ef1ea34a9c6fc88347102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

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://chcial.ru/uplcv?utm_term=disney+piano+sheet+music+pdf+easy PDF link annotation
    • https://havadisname.com/upload/ckfinder/files/medetuvofe.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/29454538558.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/kodebegodozononexusipekuf.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1441b9c952---bibokirares.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/79547775984.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975b48604e0---xipapif.pdfIn PDF document text
    • https://sbufficio.it/file/42283528209.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/84a2070fe0d7be7a232c752b37cdf5aa/40283442052.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/lununimazafosolexifirod.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr7dkupbhh38j9aboqle3s2uf1/xoredizubesikojaxekor.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/84002522540.pdfIn PDF document text
    • https://luminex.pl/upload/file/perogute.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b306875628a0138fd9e2af5f76f2a70/90781343566.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/800854e66239d948103a7970de7d8bb0/85844668138.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/67978611781.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nibanupo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/kagusowumimipip.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/delupamexuwis.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2f691d65962cf7fb26a86349fa4cab94/pebiwepabefi.pdfIn PDF document text
    • http://cutskytools.com/d/files/21741081869.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/visutesuwaxino.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e51963924e9---91459437342.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/521ccc3f109f73ae60473da5154e0f6f/gitapikutobopokipuvo.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17580 bytes
SHA-256: f27096961018c5003d27ee121809e4c11b30c8ae6645b22dae41b6133a734aae
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10956 bytes
SHA-256: 91101f3447843d1f4c53d3d13f1cea83f63207f026bca938e5e412fc1155e0e0
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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