Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dcd221d2aacaa5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 21:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8912b62057e81f6b2285b9b7efe10443 SHA-1: 5088c232afa4407793ab6557c698be444606a3d3 SHA-256: 49dcd221d2aacaa5c46d95a45d4891ce0b2272f1e8ed1f617c02cb44f8a1e2b3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://bn-biz.com/userData/board/file/51437624726.pdf In PDF document text
    • https://clubkdo.fr/img/pics/files/77206356637.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tafefuwof.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/rakobukolujimajovotide.pdfIn PDF document text
    • http://home-plast.ru/foto/files/29464838782.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/gokig.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109131634209078.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58e2cfed5---getibarukatetewalunazeve.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/95038133719.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/lazurefiz.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2556d0895d2cdeceed5523375f319a69/17505775929.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/62012893043.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25b84fb965788555ebf70b37f999b7f8/zabato.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4912f1a880a71e1e8c4e04077871cefc/6836591491.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/69075904870.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/dufisujegujazeligewuxapaz.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/29470630709.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/jitabasikelotatoketutusin.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202199451488257.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/fujilamafukeninunel.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/luxadazabibiviwijobokew.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fazakiveliwulal.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109101253397900.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/tgvh8nu8dpc4p2tsp0ph2hkrcm/55243262130.pdfIn PDF document text
    • http://gibisch.info/files/files/44885295910.pdfIn PDF document text
    • http://limoride.net/gallery/file/revirar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=operations+and+supply+chain+management+solutions+manual+pdfPDF 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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 17076 bytes
SHA-256: 2d543f2d470cbfa57a724c47bd5397ea4e65059059b085f8e9f2a84cd058992f
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 11304 bytes
SHA-256: 2dda0ce26c764b2645020149c70f4da8fcb1c999af3d14f9333ee048c2119e21
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1