Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec86c00572b692c3…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 02:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd2017699bb0272abef09e1e68d1dd0d SHA-1: 8d2ac1915b6379c57e29fe8fdd12dbd831031e33 SHA-256: ec86c00572b692c3302d5c1c17f53cb2c2cde88beb719781d7b635553e3c84dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to redirect users to potentially harmful content. The PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fifki1e41eaop7lnkldjg6vtj7/99641120247.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c47adb1f7fc---faborofinimikebowipuvip.pdf
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/22872223045.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1ccbfd14---bovakegudanilum.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2160c768b8f59285de37508821be35de/62675832922.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51db0b343---gigile.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6895535029bc7219acb13ced8a579351/ginuserovifan.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/doxafu.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/xajorabidemubaripim.pdf
    • http://sungsam.net/userData/board/file/80122921594.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f19acd623---47703114357.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ike97280324p6naarrg28nof7/banogovida.pdf
    • http://espacioschillout.es/images/admin/file/9614369651.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c37409db489e3feffe2cec57a0288177/43505013751.pdf
    • http://sva-jeanroze.com/xmedia/file/xigaranus.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/rosolodubisotir.pdf
    • http://henri-ruch.ch/doc_pub/file/49527144090.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c7ee052f---jidirupidanisozudevitejop.pdf
    • http://aj-logistics.com/stock/userfiles/file/nubofewokalebijogebad.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/30713f858ae968ccfa6e113faba95b01/bumixotarumevorufefeki.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f296b71d76---26846893284.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7dd4b9b8---33723013755.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4588facdd6---32962968898.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098326f75fe3---48061488205.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/sesedesise.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spanish+for+happy+birthday+to+you
    • 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_off0000e891.bin
ea12985bd3c0b50a7dfd423dfa2be775dbc1501ba9c598e82ddf4e520d9000e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 18668 bytes
font_01_sfnt_off000117c4.bin
9b53d1674dc73d426c36d795b0b246ae03db41f584039829b352faa6004f54ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 10844 bytes
font_02_sfnt_off00013083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16792 bytes