Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd54a86d10aab14…

MALICIOUS

PDF

99.6 KB Created: 2021-09-19 09:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 383421068d6278d76fbee3bd73ccf844 SHA-1: 0bae2fc4176de087ad458fc2faf5a5e4e8122c22 SHA-256: 2dd54a86d10aab1429c45a893fd62671cdb8e78677765922f7aba6c231b44248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=angles+in+transversal+find+the+value+of+x+calculator
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/65830431296.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/febofaxadekitasu.pdf
    • http://hcbarrett.com/user_area/file/povovefep.pdf
    • https://cli-kh.com/uploads/files/202109082127373498.pdf
    • https://kaplaitalia.it/userfiles/files/tejakowatidezode.pdf
    • https://stvorki.ru/files/file/sixarugamuvudij.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/doxupuvababivig.pdf
    • https://eletvital.hu/uploads/files/dexaxutitagokow.pdf
    • https://www.ruchya.com.tw/upload/files/80581803134.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/16673949017.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/67346486420.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/lufupubusupifozebe.pdf
    • http://etpatatietpatata.com/userfiles/files/naperetowir.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/94101313505.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446f736351d---napunozovubu.pdf
    • http://tdvvietnam.vn/webroot/img/files/ganuzitaxitu.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f40451412ac1e5c2cc93bbaa7d36f97b/mipowafixesofaji.pdf
    • http://zonazero.es/userfiles/file/zuzajafamosirizon.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210911043759.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/21265258058.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357ce9cf6fd---48770440287.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/706160342.pdf
    • http://shangyi-pump.com/uploads/file/092023221715.pdf
    • http://limuzine.md/userfiles/file/fowusizidiweze.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_off00011eee.bin
439ec24e6dbce60169c14bbac1a7c2f4d32874b40c5d49addc1d4d282b480e50
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 18444 bytes
font_01_sfnt_off00014f02.bin
97cb50ff9d68f97e932849c7b20720d6fcb2884adfb6cef36afda2f264e3b6bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F02 11004 bytes
font_02_sfnt_off00016868.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16868 16792 bytes