Malicious PDF — malware analysis report

Static analysis result for SHA-256 51322808627d7dd7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 101bf667b817baf0f4af9a947a463621 SHA-1: 6921898bd7de77df4e5d02e38d431d726dcf66a5 SHA-256: 51322808627d7dd76c31d328f213423c66c79cba6aed1a81556d0abb113994a0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external sites, some hosted on compromised WordPress uploads. The heuristics indicate a link farm and a lure for urgency and downloads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dh-life.com/ckfinder/userfiles/files/1099333736.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/kusiko.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/javub.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/81066279623.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/arirk3d6nu15i51001mulo58d1/kiwufofexo.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/74296961776.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/nusubu.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_185846.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1369d789501379a0526a0eb7378406ab/vatama.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tojusar.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dc228831---mavewakonibojelav.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/76264618793.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66b102cfb---xosataxefofegetopufikipe.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/xujikopi.pdfIn PDF document text
    • http://classtool.info/upload/files/gerizijupiresolijikezupi.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/80453458899.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/xotobepa.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c499650c7---lakevabatenugu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613988188fcf6---dalumerasore.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5k951820sk771pnjk1bbtf6to4/23500784200.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/fufemitutigapinani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+region+settingsPDF link annotation
    • 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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 19084 bytes
SHA-256: 109b84f28b984628830b1f80958e935425221dfcf13f7fc8da984f1eb8117361
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 10196 bytes
SHA-256: 3e2062febf361a6ae5667fec9f85c6bb8fb6e9c8f0d45c98b5a5614eb0f4887c
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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