Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ecfa8e0dada40b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 02:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f06b7d0a23bf43abeafb2e37c5a788e SHA-1: b62cdb941787e7d9e2cbb8f39d0ff53a35fc6a02 SHA-256: 62ecfa8e0dada40bf8e316e95b0ad227d51d0c3de44bb660b561fc111c3df9cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jaqk407u7qck66d6b64vald3gs/10170780540.pdf In PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/buwezani.pdfIn PDF document text
    • http://huiking.cn/uploads/file/07163727916.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/ninoleramukumumoju.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/defabunexetejineke.pdfIn PDF document text
    • http://asqcert.net/files/files/4083166404.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191057503991.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cba1811f---627064717.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/jukeforapeg.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/56359346387.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/82453326216.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/93908764589.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/82772685591.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/59496002215.pdfIn PDF document text
    • http://clingac.com/d/files/50102067904.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/jagewigufami.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/depunexefifatomegavej.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/10080222061.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/bokisasosixekurixesuv.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/85031728323.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/51352189124.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd59f1bba---20431183082.pdfIn PDF document text
    • http://fullx.net/files/wifudedudofadexedo.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/64245908511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mp5+player+appPDF 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_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 18176 bytes
SHA-256: cef78d81c7e6dc7a73b9d191d70d585150bccf42ef38138f9051f4adcfb16db9
font_01_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 9904 bytes
SHA-256: c1b153fb0cc432da0c03eb23014817f155b85fd0c2b8581e062a9444f12a3544
font_02_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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