Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a3ccf3b5667fcb…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 00:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cddb7e1655ea08a376826ccd87be824b SHA-1: 7c1f0690b4135583e23dfce4b688848467d17f50 SHA-256: 64a3ccf3b5667fcb877581deeb81fa081c8c13bca2a2cf866aa825e26f56ad9d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the ultimate destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://surupaceanu.ro/ckfinder/userfiles/files/67597539347.pdf In PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/sefudewogowoxenijiga.pdfIn PDF document text
    • http://landpas.pl/upload/file/39594032417.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc99e9410---fixasijafaset.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/54e56dc19cb45abeb82974ac2dc3daa2/36861913009.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f87728eb81b86744b08a9a95a5da8bff/52735465736.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/46071879706.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/55457839320.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/nodaneviwidomute.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zotabubu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bbd239d48d07dc00a01c3b51991995d1/3209470258.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160744030bbe57---nibubiwusolilazasilepojum.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xumifusasunixevuseve.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee3b591ec---soperekokebom.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/jazimunewakesuvurezod.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/gopuwopave.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160acfffdcaec8---jutagazobubudan.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/xemevivadoxilera.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///larefavedaxujemabof.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/87258459629.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20218111115394069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=convert+multiple+jpg+to+one+pdf+documentPDF link annotation
    • 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_off0000c3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A6 10960 bytes
SHA-256: f658e5219367d731b936274ebf9f5c2bd3517669be8c3be98fc3a07082f9aee2
font_01_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 17472 bytes
SHA-256: 99aaf32122426f1a2f6dc89a8c218c017d44a64ed6e0c3d5cc132a0e51aacb7f

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