Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe63e748ee42948…

MALICIOUS

PDF

86.3 KB Created: 2021-07-08 00:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb736b8b3126f8fd249ed877418a182 SHA-1: 26845e43910e8c3c143a51eebca1a1f82cf20212 SHA-256: dbe63e748ee429481bcf3f5ce696825e84588198dcb63c17c2bf9efaf7067766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the linked domains indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=what+is+the+relationship+between+predator+and+prey+populations
    • http://trustycctv.com/ckfinder/userfiles/files/gugupoloxo.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/317bc91f4fc18a31b85e8fdf58998ce2/vokadojudalisovoxujujon.pdf
    • http://haohanlegend.com/Uploadfiles/files/rajixumuzepamamodo.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1paqp2n6nv509qp8827t1o85uk/xutudidivuraziguwasetib.pdf
    • http://modnyi-buket.ru/uploads/files/69348428157.pdf
    • http://buergerforum-tirol.at/file/61354390707.pdf
    • http://mhs69indians.com/clients/864804/File/55912897303.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sed42horjoofp5qjrhblefivd5/16447352884.pdf
    • http://internationalnetworksolutions.net/files/
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/bosalasexevazugeb.pdf
    • https://koreayokogawa.com/ckfinder/userfiles/files/moletigelelegoruju.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/s874v5idbqs7mtcdfftapeo643/domixodenu.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7j2minl8iki2rsm71lai5lu54a/walonelotuzede.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c578e9f6f2---danerexa.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/navowizibaxulomupesa.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607351c948539---mazupesedodemenefati.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/n50b3sj59mpov78mn5enc8j8uo/26741053340.pdf
    • http://afghansolar.com/userfiles/file/zejewovowedowelagatiwe.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/c28fk1q8abmfa2ag109bkdlji0/zidegarigukajawiwufupa.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/29c0248b8c65f73a3f7848daa0af6b3c/gisinapemuzewud.pdf
    • http://24cvety.ru/upload/files/34756346366.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p3gah2o7jdlkub37t3oifupoa6/72433150806.pdf
    • http://spreewaldatelier.de/img/editor/file/gorusajefuki.pdf
    • http://studiomanzella.com/userfiles/files/ginurejejinodabizep.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af298f1cefb---wisodomexodapiz.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_off0000ed35.bin
a87045b41f4acc6852ad7e341bd3be8df1c5f2e221f3bacb29907d9edc65f234
pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 17200 bytes
font_01_sfnt_off00011a25.bin
b4a02eec5b3c39b6df3c68304a566dd88e5acb715b305fc44c9a7bd7d389244a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10920 bytes
font_02_sfnt_off00013334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 16792 bytes