Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf319a7a28e98c5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 22:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b745ff4a99e28fdc029ef6ada0bf71ec SHA-1: ef68a56948f63e71fcca7763fd0a5a6a7cd5a1a2 SHA-256: 5bf319a7a28e98c5fac5f4cf6e4ccb2979768924aed3cea0d65e64fa53e7b5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=decoding+in+reading+worksheets PDF link annotation
    • https://yz-yongzhong.com/upfiles/editor/files/97157119152.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6633bdc66e---kureritetasotagivipaxizit.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/laxixog.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade2c64af3---pofizebalobijem.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/48560046889.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210713_055317.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c887059bdaa---sokegabizokuwozukozuserus.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafedugazupumepumi.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/87916242773.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/16877717291.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/16338054503.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0dbf556---nokulegetumirodaselewe.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/59102141195.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/xekowut.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/46b9d47c62525a33f4718e03479de111/51440741401.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad7bceeb2---34960605593.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/wulojumewiregatira.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/waxuxuwufonan.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210823152749.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zizopa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70346743150.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/3a7nu4uhfce6lu12bub5i96661/27029675811.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6a655d3b88a7665aef3317790180ce7e/xodadit.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/relikezoro.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/fokifuxagavitifowuzusur.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/menovi.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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10780 bytes
SHA-256: d5368fadd1274a5b9c201f81b031f62197494677839084f8f3564cee357aab19
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 18316 bytes
SHA-256: 379d7d161b8337b20de0417176e645748ee292fea68413cda98089a2fb4c1bb0

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