Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c58535cacfc0e3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 09:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e1fa14fe3a52f52dfc205cbef3041a2 SHA-1: 5e60ff77a91f48ee996fc25f3940d35d5b369e9a SHA-256: 63c58535cacfc0e31f07dbf257c80c22b1020f8ce523bcca75e6c44e8e90825a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The presence of numerous links and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=summary+chapter+4+the+giver PDF link annotation
    • http://wabasnb.com/files/fckeditor/file/1777768671613b3b6cda931.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nirere.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb51be3522---kasetud.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/fugomezedanenamusemifumam.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412fc3c6f3e---21523421465.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/tomit.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ortkcovdok18l1rcenspiihp9a/januwefetanekevuga.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332f7556b00---88888423186.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae395e5aba---sasesitizovuz.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210913082545.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d249a30a0---10258545401.pdfIn PDF document text
    • http://delve-cr.com/uploads/53628343512.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/kunibesamigop.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449205085---kalenumegasuxubemat.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/ruwusatakezifili.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/62104600635.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/15597887765.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdfIn PDF document text
    • http://pinxedien.net/upload/files/77676627841.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/9023004477.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jexuwevejikiba.pdfIn PDF document text
    • http://8njl.com/userfiles/files/zeguluzira.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/mukegaropurituf.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/12583536731.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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10816 bytes
SHA-256: 285e2558c78bd62f2dbc9b44565b6fbc2df17e3d247571e1f6d9b4b68c01d736
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 18100 bytes
SHA-256: 4d6ecde5fd3cb47d3962ca9753c34eb8841da7bbd8a55d4f04c8f9fe09ddd93e
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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