Malicious PDF — malware analysis report

Static analysis result for SHA-256 108680aab2554924…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 22:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c684cbf677c44a758607dc09be43fa8 SHA-1: 21d81743c604a23ac249333d84da8b96c5c2747a SHA-256: 108680aab2554924ff55037dfdbaa0a3004dd5c91dbb18c3c1df05ee7891a4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://crysiq.ru/uplcv?utm_term=russian+army+ranks+and+insignia PDF link annotation
    • https://esprimagroup.com/userfiles/file/kiwebusefoxigawa.pdfIn PDF document text
    • http://lgassociates.in/uploads/roroxolukebufuluzabeg.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/perin.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/luzekafu.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dogutujuzevisud.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/woxefokorezikevag.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/9953140848.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcffed8cc4---34741191345.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8c23add2---xogorezazaluperefazupivad.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e1403c93---zuxodamiwatuperowari.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/172190041.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gezubelive.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/kazoduzo.pdfIn PDF document text
    • http://agama-rc.com/upload/files/selasiponowuletu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/10958620206.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/21958407293.pdfIn PDF document text
    • http://fedime.org/imagenes/84782920625.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/femafepexituwuvepopomunel.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q28n5hn7lodhqet6mgreh0mjo3/1388724051.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/23228636540.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/57440973517.pdfIn PDF document text
    • http://canoeing.by/pics/files/10385173387.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/rusegufetokiro.pdfIn PDF document text
    • http://dbpedia.orgIn 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_off0000be97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 10548 bytes
SHA-256: 94e3c8e42db2276fe9c980a44124dea4693f1de9a643aa3f02d823b0a0911f0a
font_02_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 18784 bytes
SHA-256: 671b8e351672b2f138bdace42f42bc0c2187345d32b8f25f6a9ce7ebd786f8d1

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