Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1dcdba171aebf3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 19:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d88ac625311b706181de437891ad401f SHA-1: 2d125a2aa316424b6c1050c5e13722e7552c7618 SHA-256: eb1dcdba171aebf32d616c21c6b6e040dfe8eaa19667405c83d2ad6a9a9feabd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://amphorabeautyclub.com/campannas/file/tanogovovem.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/lifibixisikijudu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/77451792355.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9aa68b6a---jijepedadewaseluxeru.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/87340111474.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/47364645368.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e339b951f0---vijetepopokositofeb.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc270264896.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/xunud.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052220514090.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gjdp0vs9lr9mcrorlo542mkfha/sufowixokajudojezazaz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e7573d26---79153509831.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/f17mqq21o3mmfv6k746rfkanh4/25133821082.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/42963994706.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce013ae9b---53351688397.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/59624880859.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d96no3seudeafk8ujs1hidsta5/22764751220.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/71476990513.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/68274251779.pdfIn PDF document text
    • http://adria-ex.com/zifuruwevepuvulagudobuxop.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/12547898842.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/576d08c6b03a8ddb8934d25c0d8dd0f4/jixejobokes.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/32679331183.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/jezitixosojazib.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f93f7f392---47916792118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hippocampus+sparing+radiotherapyPDF link annotation
    • 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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 11120 bytes
SHA-256: 86f9b2a59a7c3782c9b617a18f344cc9e102fd13752a31093ac3718cac4abf0c
font_02_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 17152 bytes
SHA-256: 17b5da45ea7148700783c2c531e3c52345dca13e7b429c54f0c11a1c47294857

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