Malicious PDF — malware analysis report

Static analysis result for SHA-256 792c34c805b2d827…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 04:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7628bb20142c0824200e90b7cb9db8d9 SHA-1: ce9c8a9740e7880c451f5c76256444bcb4d71d6e SHA-256: 792c34c805b2d827e1d8dc290067594a39cddd7f3099a0d4fbf1539f46253112
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and external URLs, flagged by heuristics as a browser installation lure and a phishing/trojan. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and external links likely serve to download and execute a second-stage payload or redirect the user to a malicious site, consistent with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=chromecast+cast+my+screen PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c37b9609a---zivugorobuwovovoxe.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/gedujomapo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef8dd4a23---gufolilebanurajujekefe.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/71653584829.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/jojetabafi.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/68320939842.pdfIn PDF document text
    • http://unseretochter.ch/images/file/jepene.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/wezomexojuwigub.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/bakovefasojorevivub.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/xujefuvupovol.pdfIn PDF document text
    • http://abworder.com/uploads/files/32870064526.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wakifafugi.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/pefipukigiwopusematuzukub.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/riwesaboxopuxepi.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kuvosa.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/53652893542.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8386c770b---95250763405.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/32038307003.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/83026486250.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jabeta.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/18175104858.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/40756285935.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3a0ab09c---kamunisasemiges.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/19374043027.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_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 17952 bytes
SHA-256: c56b6d3fe1c52fb05ee19212d40a4130c1f7c42cdfbc1470b77c3dae1a3b39b2
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 10504 bytes
SHA-256: 5a440770f7d3705a4bc93242b3fd15dd1d6dfaf8ef09fc49d03c2ec50c02ce42

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