Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae601ef136f39c95…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 09:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a284cbf956a69c4116f9f33b3e19dddf SHA-1: 66f799b4f97778d71aada3bff0c5d51b78816a98 SHA-256: ae601ef136f39c95adbed9416bedcc9cf67ee3e8fffac15f4a961234fe326f72
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting it's designed to lure users to malicious sites. The document's structure, resembling a screenshot with a click-outward action, further supports its use as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=derivatives+of+vector+functions+pdf PDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/dcee2cd2f3eb62aedefff1d5629ea888/lunusavodivagidik.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/kajep.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/jinunikedodu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/r10am2k72pm4r8s9oo5rvmjmg2/77982168407.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/87047393364.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/46462698084.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7d51cf71---12247072082.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/mizinuvubarul.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086cba8a3e3e---nafuzuxetafarijelivuxexez.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/8057914172.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dd4d57073dbc22aacf24daf9b9ba0126/xukijometavipibefito.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8fb8c68f0457cc751b15753535154b83/27268082051.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/tofobekemutalevoxar.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b4a66259---20830993880.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/pubodej.pdfIn PDF document text
    • http://www.bash.cl/media/file/fevijutodez.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f50f122e---86369728243.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3qlhkkat1a67kihkjp15i3s4o1/19319969485.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/rugivatuge.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c87041630---43794101718.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/90195381684.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c3893e0df0c3921fcf9140966050b6e0/zidove.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/59188720043.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16128b46d904e1---41753699299.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736726995a0---lasutizivawiwireluvitu.pdfIn PDF document text
    • 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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 10732 bytes
SHA-256: f0ac8f1345703f0bb75d4786107727434eefdffae20752694c660dfc68f2f574
font_02_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 14296 bytes
SHA-256: 5c552ef66d8220f4156c02a7ee540ff74e1f5dc07269987dbcd561ddee14a0e4

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