Malicious PDF — malware analysis report

Static analysis result for SHA-256 853f4447fb8e2e72…

MALICIOUS

PDF

112.1 KB Created: 2021-07-02 23:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b45d8a7ba79e42df7438dedf7ae54d1d SHA-1: e06b1a675d59e3cf2ed3443031731c5ecc974d44 SHA-256: 853f4447fb8e2e72c81d6457baaa9bc5664059e18e868e2df29e17f869e6d3e3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious payloads, aligning with common tactics for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=geometry+with+an+introduction+to+cosmic+topology PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947135d38ee---gezalezefumatuwab.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/188e2638b1c652647431ee6fce5da2c2/80605094557.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/6199899444.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc3a42c47---texufasusiwedek.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a1470a065e70db323a60b052bfc76cf4/tojikupekewukimogatajan.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607031b851428---39015553667.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0f3a27fa---14915065915.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/itl7pvio1ftlf5vrtd9fn9b3a4/8128098763.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7303da69e72c68ca72e63ab8630343ac/zebosulagiwogoruva.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/1640449314.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/tovar.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/32053673062.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/58416326214.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/17473340994.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5eb42d31f---90094250749.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c165f90dec3---71727247970.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210701035130_ulfyzg.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bafobalepetolupukixid.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1cf368d15ad9a7764d2e8e1d815f23c4/42125439408.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b2589fe8611f8b73cec74bf3dfc70cc/36529686105.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2fe63d335---zutadeduzezibigoto.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f645618ccaddaad0ebf38cdd798f268d/60245576628.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_off00014b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001638a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638A 20380 bytes
SHA-256: 9db2fad7dd85386b536399e263697c61fa9531a2a380987a8da51367d707e33e
font_02_sfnt_off0001971d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1971D 11300 bytes
SHA-256: f7fe0f688567c6bdcfcc93addd448f781b0121158a2933b607691b92b613ea99

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