Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0ba5be327d2396…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 21:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f66eae2a7face0827044c52fab744002 SHA-1: eb0a1a7ec1158e900aa09f04ede7eed96fa5dee6 SHA-256: 5a0ba5be327d239671daad38d5c9d11bb1cbd12ee76c8c954268df146e847e47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_QR_LURE' also indicates the document may instruct users to scan a QR code, a common phishing tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ecoledesgourmets.com/userfiles/file/16508476214.pdf In PDF document text
    • https://cokhivietuc.com/img-vietuc/files/82388572285.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/23430628330.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d296bf0141---95647789059.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://apsara.ru/userfiles/file/21829002642.pdfIn PDF document text
    • http://gro-felix.si/uploads/67502189483.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/79180492986.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/buwezi.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/kofikijosivunutofukaxuju.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/64290929820.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/92883135232.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/rokovejevutuviket.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/regetib.pdfIn PDF document text
    • http://bienbao.org/uploads/files/xozewukofudilebozog.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/46334568206.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/99249611428.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wonudiguvupatu.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/pulijolevigepagotok.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443a6e225eb---80063609923.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614479820dee9---jusej.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/26738203103.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/mokajivebazevuretogu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/de5d2acc8815eb769c7cdae00810b087/bekuta.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/11692128826.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/61943989998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=transfer+content+to+new+phonePDF link annotation
    • 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_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 17444 bytes
SHA-256: 80da73ccfb1492791a7a62b5b20e911d28534aebf7a0f222e43aa1d51e059b75
font_02_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 10488 bytes
SHA-256: 273aecdc9728226b011ac49353c85f1aad535b3aff56d1e5c2caf2dfb5767343

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