Malicious PDF — malware analysis report

Static analysis result for SHA-256 271f11b36ff9f2c3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 23:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 212b1237d40c44d0cd7542500ae51915 SHA-1: c9d762c3eb6735f10388f0c7c91274f45b8a6e29 SHA-256: 271f11b36ff9f2c3191b95a974fa9f0e99254cbe6e02df0288e60b3abe26b58c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links suggests an attempt to obscure the final destination or increase the chances of a successful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mysmartedu.com/uploadimages/files/woperokonumu.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/melazisuzudidixanikij.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/edet73dmtov0pgajf7okh6pgu1/60492918038.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2e71b061---gafijekepurelunufura.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6130aac62d---godabovaratavevozufiret.pdf
    • http://www.tobywells.org/media/fckdir/file/revudukowojojesovu.pdf
    • http://meble-tk.pl/userfiles/file/62356071241.pdf
    • https://sonarmusic.hu/up_image/file/xolelawiruparakiganipe.pdf
    • https://canevastoilestjean.com/upload/editor/file/gemuluw.pdf
    • http://yuhenganquan.com/userfiles/file/20210621081707_899807853.pdf
    • http://mamaskitchenorder.com/uploads/files/73023451142.pdf
    • http://maihome.hu/admin1/file/42941170891.pdf
    • https://ovalpolycoats.com/media/75319022693.pdf
    • http://omni-links.com/images/blog//file/90607368095.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160733a2ba75b2---22174464279.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c6f4f6f08331f0627a2abdf46aa259b4/70345738902.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/777f061d3ddeffc7d967899bb1548683/ketikipakuteriwijaxuja.pdf
    • http://nuraski.pl/wsg/userfiles/49021931932.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8047f61a---95204635972.pdf
    • https://5a.ro/ckfinder/userfiles/files/50410066312.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb6bd7610---53031532953.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/63941695490.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/magulapetojuta.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=parent+child+relationship+building+worksheets
    • 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_off0000e8de.bin
261a7c1f53e57e60233b62fd69ae719a9aecf2bd81f63658b40687311a26525b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 17304 bytes
font_01_sfnt_off000115d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
font_02_sfnt_off00012de7.bin
f4f2ecf4ff5a448a33d8340a091d53e4151f74b5d80a0e0daddbbd552b162516
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 11212 bytes