Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5fc2a9cb90d914…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 00:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adfe307b161068ea92c0916f8785b99e SHA-1: bfd61a2ccf75349eda059e635eb34c4e5a665f06 SHA-256: fa5fc2a9cb90d91415d88185e71a9d3cc4ef986aedfaa39870fd5e3365efef3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

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://infrive.ru/uplcv?utm_term=sensor+camera+poco+x3+nfc PDF link annotation
    • http://lednotice.com/userData/board/file/97484276265.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/84195694802.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bbfd12e87---93712773564.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/93473724255.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/buret.pdfIn PDF document text
    • http://jawarakreasi.com/file/wufuxubefuwo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6cb970433d521f167b9577dca94fa21c/31136936561.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/11623877786.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/varamapudodivuw.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wosozukodunina.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/nujamegum.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e90672ab307bccf120ab8c1292f0f640/2643415830.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/zijijetepemadi.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///difolizutil.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kanemug.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/28031178510.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/daxogafupe.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/37645075068.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/jefasuravenano.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/vudafugijopubimoxamet.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/70658341886.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/zuwedazeribimejaxas.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351344d2a44---11849997853.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/povuxivemawur.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/28993261558.pdfIn PDF document text
    • http://surestegc.org/documentos/file/65106119262.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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 18324 bytes
SHA-256: 5846c52e35eaafd01260b5d2180f4642024915b857ff4821894bb73a663f9a2d
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 10752 bytes
SHA-256: 5acc4a14593a0addd7a4009440f8fe5cf04172211f84487318daf07a12a812d1
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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