Malicious PDF — malware analysis report

Static analysis result for SHA-256 8790c62e8198fdb1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 03:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc16e5c4ed1c9ffee5b08050ab7dd9d0 SHA-1: ace105b65f21e91c3e827012eb0abd7d1557c4f7 SHA-256: 8790c62e8198fdb16f4ce8aff0e196a5cda8543e5c8e7c2ba14e0b567ca54c81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=send+sms+android+programmatically PDF link annotation
    • http://av-jet.ru/userfiles/file/mowofewamofuleput.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/36324924827.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemekelojesuxifotubivuri.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/6954616169.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/85220231302.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/42424240451.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/pigilafiwabe.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xuvafoxan.pdfIn PDF document text
    • http://infosierra.es/images/editor/24864258057.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/69021005352.pdfIn PDF document text
    • http://terryloops.com/E/file/28744963075.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a9ce289b---37174540645.pdfIn PDF document text
    • https://onlinendttraining.net/files/12777601680.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/38844754396.pdfIn PDF document text
    • http://ciskmv.com/css/file/konetijaruj.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/64248585763.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e25d2cf47b---tawalonajukeravilix.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/61191157821.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/gulek.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/kurijakowa.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-23/20210923204500362329.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/buwafipuxufanurojir.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/rebobekim.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/34ea3c032067c463b925ab5caedc7faa/figuvejuwe.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/29570749083.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5c2b1a90---lirapilox.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc247cee65---kawamupe.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_off0000b994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB994 11048 bytes
SHA-256: 8e2c7cfc2b9a05becead777d5b91f8ae49b77316c5c92c7bd8d3130039e15bd2
font_01_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 17304 bytes
SHA-256: e5fd59737545263514b3dfb00c4dc1cd3d728bd23b2ac132508f932e6d2e5dbc

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