Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7e979a292ef3f0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 21:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b3aa0e5df65f62d9853427fb3d198e8 SHA-1: 36c2f7bc06317c90174291195806f130c482efdd SHA-256: 6b7e979a292ef3f0a6c111232e6643d2a07a3111b132b98a65cbf014826c573a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jbdclothiers.net/emailer/userfiles/file/48572864125.pdf
    • https://theptaynam.vn/upload/files/doburupepi.pdf
    • http://amexeuro.com/an3_Uploads/file/68838458548.pdf
    • http://handsonmontessoripk.com/userfiles/files/20364817650.pdf
    • http://aaykpn.com/uploads/editor/files/26890093652.pdf
    • http://ashokarefrigeration.com/userfiles/file/nelitafi.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/61064455524.pdf
    • http://syntra.pl/userfiles/file/50245656105.pdf
    • http://satcomlink.com/userData/board/file/zifinipapaze.pdf
    • http://keramann.ru/uploads/files/pilugopelipamokemotuvijen.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/83b168ff95996b73b43d72437835a249/14189869591.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b2eaa85bf---wudegurebisakubezegagadev.pdf
    • http://kencert.vn/uploads/image/files/44896204137.pdf
    • http://geoass.eu/userfiles/files/bakefolijuxuguzugelutof.pdf
    • http://le-bouquet.be/userfiles/files/tuseki.pdf
    • http://fkjz.cn/upload/files/2021/09/202109160013252447.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/330bc4fe0d1b855c8f63f7fa02930d69/44173829040.pdf
    • http://thsport.dk/ckfinder/userfiles/files/gorixeb.pdf
    • http://argol-editions.fr/userfiles/file/tufixiloxazixutuxaxevate.pdf
    • https://ceylanotel.com/firma/files/sepikamiwelivinuvexuxe.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/masikinilu.pdf
    • http://seteo-dechets.com/images/file/sawunusopipurol.pdf
    • http://wsystem.sk/userfiles/files/minotakenemalis.pdf
    • https://shirbandifelt.com/userfiles/file/lexot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=paulo+freire+pedagogy+of+the+oppressed+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b82f.bin
a1083841cc372b3174454564338375a065c316110bb142ff4e1d5e491129dad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 19992 bytes
font_01_sfnt_off0000ebdd.bin
1867bf3fa6c79c12477b9dcb9a686f603c9ad9129472c0214c5d7a516706eff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 10888 bytes
font_02_sfnt_off00010505.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16792 bytes

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