Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9017a9082a7f22c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-19 17:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a70dd6d5b240f7d32362cb5cec3dc0e1 SHA-1: 6545e8de24a2d9b16962ea8dc6b597154f55240e SHA-256: d9017a9082a7f22ca220cdadfe19b2f68340d815df888dfbe355fbc946871f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links pointing to potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=naruto+shippuden+ep+123 PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/602efbf30b1612642d8132af6a93c569/27491139429.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/metemav.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/60717681011.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fadoxaferosofisud.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463b7c960c6---61971340126.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/24212089531.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130819437b86---tobavulitakorasun.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/vulas.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/20974602556.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7919582093.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/01/file/nidepeze.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a2c696abd2b3e5bc5a70fa58ef6625b1/20478231656.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/94626380769.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/ripigujumonenisa.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fatorobururamavotide.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/75070131201.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109140813157619.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/rigisowalag.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/17659076771.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406786b16dc---nazoziterenofenaje.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/48012076973.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/33949221306.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202197103215069.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/vutemulelegup.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/puxiviwitasulabolodim.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/57110312726.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10864 bytes
SHA-256: a46a284a133c5f77acd8e13e8f051a5aa519108a21b376328ce80a598b363763
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 21332 bytes
SHA-256: f573520c45ce6e40de8a693d36e835aa46c4238db9656b725024cafab357ebb3
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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