Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263deff5f5b67b7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 18:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70542bcf34f9e03944590c9fc46d2736 SHA-1: 77c27f0553ee6648e991a76bcee4ef5cdf4993c9 SHA-256: a263deff5f5b67b7580b07dbb74c39b34fd4161b42ab6feb4b1bcbb32eacd893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of external URI links further supports its role as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=lte+only+apk PDF link annotation
    • http://intproplaw.com/admin/uploads/file/99471841055.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/12435313717.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/sarofevatiki.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/zidumazawezetolosupegiko.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/buzojitoragokodidut.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/javodozegivizetu.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fawakifugorixali.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a6cdefec---todazerexaf.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4afcb1cf47fbd48709041008d0d9c826/valopenanegegufufanejerup.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/96f7a5fc05b45adbd7d9da75d002a2ae/53045320758.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/84021450968.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109110011117549.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb8513f7---6187430577.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oc67krh6drlj852pob1k37j856/14767448174.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/34315452749.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/migibegoradeselepi.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/ladedaxonefaxanopasages.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/garexured.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b384cf7a5379831fbd8d5ab09a572de0/tizijela.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61316a16952d2.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/285988818cf931169376ac2c21625144/33997895335.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/84792993514.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/durojugodokusetawikiboko.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_off0000c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 17888 bytes
SHA-256: cd3da60825ebd3157f6dd32b1ad37b17f96f2aae560c246c5a84388564391892
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 10048 bytes
SHA-256: a441ee94838c0ad39281303ea0fef8f0065e754b17293557091fe2f17231ab12

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