Malicious PDF — malware analysis report

Static analysis result for SHA-256 177f2f1d96e00404…

MALICIOUS

PDF

71.8 KB Created: 2021-10-05 11:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f497da1487fdca7e56cf59f5c70db16c SHA-1: 5d11f4e1f4dd351e5f09f538949f4585ca2ae913 SHA-256: 177f2f1d96e00404da280dad846f89429b9bb73b02df4be4aa83976ceca19955
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=meaning+of+electroscope PDF link annotation
    • https://meganimal.pt/site/upload/file/wefavawesuvudubefefer.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/ropujidelatumobuduzis.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/18078920806.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/63441071210.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/tixabuzama.pdfIn PDF document text
    • https://poker-fire.de/file/88146147832.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/34036954046.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/ropebekalatupev.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/5690292620.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/fomusogagimekesavizaka.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/wumeb.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/56g2nhgeh5grvhecvoruaongu4/wikajetamaz.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/61331709099.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385667e215---rabududimu.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/20513963339.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/90996466586.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/medosuporak.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210905/1902523344.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/17316560128.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/xagad.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nuxurixixepiganu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa186a2eb---luwutawijafemebuvepibuzin.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/pelafo.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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 10648 bytes
SHA-256: d942eaec25cac6146fe6a3ca1002196ae96bb4e2ddfd203922ecb1bf127234fe
font_02_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 17692 bytes
SHA-256: 3600d8f52ae777b5f9b98666cc5ca7447b2f3572232026990e00ba2d4d299ebd