Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb5bc2c8e3ede6f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 20:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87dcacaf978e6d7585396a5a717b4a6a SHA-1: eb497dcbe365ea22e969d73b90aca217ccc1374a SHA-256: 6cb5bc2c8e3ede6f85e1ea9f83cc83c86581d3cd246e3df54212e3a15a097e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=tap+tap+apk+download+apk PDF link annotation
    • https://vmwarts.com/ecovic/file/nisurajopadukexuxuzub.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909103347.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zijomexow.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa99a6eb25---27747251260.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161384213c3898---tovamoradejurob.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/78771401184.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/84450016827.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/rerut.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/72908652031.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/13142158282.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/97788207488.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc28e019bac4f977e0a614ad2a817ac0/50553252708.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/64570458883.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/38897434863.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133a43cbaf04---11042195690.pdfIn PDF document text
    • http://canadanur.com/resimler/files/48890349027.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139340937da0---192945948.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365a4248a80---53761601210.pdfIn PDF document text
    • http://rld-carbon.com/file/29898061931.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/gerozomititonatimosujoxir.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/91160375318.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613101728a719---tiragaturefawunajumif.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/58953829810.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/93491949418.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/35674359899.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/kegowub.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 10036 bytes
SHA-256: 4c40736d32816bc2d50ea6c60f43130f5d5ab13b7657be84f30a4f21cf5e5db8
font_01_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 17864 bytes
SHA-256: 45fc5ce2c8d2f8c3a5ce4200bdbd67cfc4d0b8335cba6bb2b5fb456c3c7b1a09
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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