Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8466db772abc27b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 02:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 855ddb436bab45989789d82475aaf687 SHA-1: d48e06db31fee3ee7461121b5974489d3bcdfccb SHA-256: d8466db772abc27b6b63c80ebe8f9c32069f85cdd2130054529757b4750af965
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by heuristics as malicious and a remote-support tool lure. The document's structure and embedded URLs suggest it is part of a phishing campaign aiming to trick users into installing remote access software. The ML classifier output of 0.994787 and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://auxerretv.com/content/public/file/21266655313.pdf In PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/21620143276.pdfIn PDF document text
    • https://rosycaffe.com/file/lulisojutikizezape.pdfIn PDF document text
    • https://agatanorek.com/files/file/80265488348.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614651bf66c53---13151122820.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/wagifu.pdfIn PDF document text
    • http://e-district.org/userfiles/file/85709495094.pdfIn PDF document text
    • http://bjjiffy.com/upload/majisagerabi.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/vorisomasukadasememezivez.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/kewibosuw.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/64130935515.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/budevemimip.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/bujowimolatopidoz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd1136527---narobataz.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/380285253.pdfIn PDF document text
    • https://mkontroll.hu/File/polupufadez.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/97255843445.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353b353d3c3---3366338699.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/butijepetawagotonizaj.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/wiwapugolavirugewuj.pdfIn PDF document text
    • http://logicamail.it/draft/media/zewuvilo.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/nezifakuwivejokifubinosoz.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zitopukezolojijoribew.pdfIn PDF document text
    • http://df-foundry.net/d/files/67315514423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=acceso+remoto+a+celular+androidPDF 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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 10612 bytes
SHA-256: 0aff186f157f295f278994edb29867f48eb8308eb134b122169a93c77d4760ac
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 17228 bytes
SHA-256: 1ae8b4a46136f30ba5b05acb373dab1b76e7121af7823b85a0de76be8d505e96

Open this report in the interactive analyzer, or submit your own file for analysis.