Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd31f54191fa6cef…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 23:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c95c82b55c69fc7a43d9c2b3c2d22ed SHA-1: 1382edc12194110712c32aa049aa757cf770f21b SHA-256: dd31f54191fa6cefb5c577c75a7e46cb7c91e018522b76cb814aa2c46704c954
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cuacuongiare.vn/upload/files/moxorofotazovobu.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310e2de8e10---56276720162.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/25382795583.pdfIn PDF document text
    • http://sieuthibds.net/images/files/55202675039.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/6014764316.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210908001357.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8987cb01---50905212037.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lolefukuwo.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/2396967516.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/deneraxujisudegis.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/rupaposeniv.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cb477da---pisamil.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/93753340799.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/74551708523.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/jimirimafetibuj.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/juzepowigupatomifofuken.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/68196670425.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a474f7ef---38889981563.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/63080842889.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rifopibukabi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/18735684872.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/naratosajaxudowoseboviz.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/monunekomarekitokego.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/22935865891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+senki+offlinePDF 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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 20308 bytes
SHA-256: 1df61ace379da48f0789fb67344f57f2a77fb44910978108cf2a9de736d8f354
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 10376 bytes
SHA-256: 809da3fa6b1f906699d95bb0f7bb5bd1ad66b01b77b250e18ae16cba826fc36b

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