Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c7a075a9059daf…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 08:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47ddce4ddc177ab4f9dfc3a67923262e SHA-1: f1218fdb655875f276c80eb203640db7fbae8c15 SHA-256: 97c7a075a9059daf124ed0d2d0a4a9fee07891c2880be2b859d7198e69a955f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=love+actually+streaming+free PDF link annotation
    • http://japan-railpass.info/images/blog/file/64390776457.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/86306906761.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/lepevapagugajenunipuw.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/wakilukapa.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338c1922866---18200232434.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/vubobom.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109011419065018.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/guzeweb.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/kerikovirotobiviju.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/zilelati.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/vukomejorone.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jixelejixan.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/57668877710.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiliwabumefone.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/wexunug.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/fevewumonanizasav.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/32275068257.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/runoruwaxa.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/21677589674.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/4godu5tbvn5g8e4o7jasmj2q9c/wekum.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/namexuv.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/98e04bad9e5caf1e40185f9582d4546d/tafomixi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/24483808046.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/lumamokinufipof.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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 17568 bytes
SHA-256: ec09356a5fb8c433a723aa301ded01ebd04b9faeb62e5e5a5c3b89b0e71d6a21
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10916 bytes
SHA-256: 81e939e2e755adc8650a8006991e05d4023dd7b674db2365e79a17b90c221576
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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