Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ddc500ea1f3543…

MALICIOUS

PDF

112.5 KB Created: 2021-07-03 20:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b574c0ed6c33d3c5777661112ab14f7c SHA-1: 61291500ffa99c77bc4653a75069ce55d5d94eb4 SHA-256: 72ddc500ea1f3543337cceba40cdd6e1d48586978e46151d73d1fcdb142292b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is unreadable, but the heuristics and URLs confirm a link-farming and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc7c62811---nomalagixovawapu.pdf In PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0aa7267e71c59bed74b7bd9aaa0a341f/gifudebuxe.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/mexodexiwet.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n5frv81kap4nno6p9m6lilmca7/roberuzowe.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/i9m9u62ds5oaia12a3cnts6j01/woliraxunobipaxebaranizon.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/92106871477.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xoxosa.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/fawefumulunivipax.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/14000798313.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609651dee8739---93898524373.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fd749dae---vidanufafonaxisuviwijim.pdfIn PDF document text
    • http://mqskin.com/luutru/files/nasokelexet.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/gumujigijerubowoma.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c5dead2fc2de996fef0e26bb252d2aaf/27204472673.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9f11ccfaafa58083f3c637671c29c4d0/fizodabawefoz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdedbdc540---85363897827.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cf2476b2---54127380052.pdfIn PDF document text
    • http://446888.top/userfiles/file/72179768951.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717eb243a12---lonokelinisotelunewitasox.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/51300936385.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/63197624521.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/seribivabuf.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b218fe48d8da94e37db09139d2dc5e2/rovebarenolevafuf.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/270e534fc3c5f46e61326ee62e1c8423/86404387869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bosphorus+and+dardanellesPDF 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_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 10452 bytes
SHA-256: 1f740d7612a9456cf3c84299246ddbc8d53338041a209b4c5cedeeaf9be22f1b
font_01_sfnt_off00015d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D61 26964 bytes
SHA-256: 662e18aeb0b1fed3c35a8789c9c884a703c9b07a932d239dbbcaa020b277884e
font_02_sfnt_off00019ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1