Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a9acb12793739f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 18:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd46a2a74777f91ec44178e72fdd1752 SHA-1: 1fa8e4791304793c3459e775a959a35902476c54 SHA-256: 96a9acb12793739f9ebbc790ed478668720463d2655096b4b4ed64d834eea4f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=genetic+code+triplet PDF link annotation
    • http://restaurant-lyons.fr/userfiles/file/40502847637.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/33195059110.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9601b08b2---56618244099.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/5282140952.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/89578991021.pdfIn PDF document text
    • https://songhongresort.com/img/files/posofonisuganivipozowove.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/budeferisexurip.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/47802421035.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/bafaluzavogejote.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/jepokojexosifefeteroma.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143179c2ec60---zurerovetinuzevamimoja.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/sakawena.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/89264717647.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/58188224969.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/29495431027.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/tirunibizuduv.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/94bd27384c8ed0cd17125bb53cfe9eb6/zoparapibonuwagegosed.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/mabavewetup.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/56483260735.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519f03766d---28482244315.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/21638095453.pdfIn PDF document text
    • http://idcla.net/upload/files/rerama.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/vegibuxovivu.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nezow.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/42360815947.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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 14668 bytes
SHA-256: c004d887608d7f2f4b7f18352b316fe7375eed103e8e414fcca9c73861c2c600
font_01_sfnt_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 10216 bytes
SHA-256: 7b8cf44ac37aeaf3c9a794bddb39faf9f60cab27a112c8b231e7a3f47b9d1ebd
font_02_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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