Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd0fbf857d7361b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 10:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34c67008b87f7c5ccec5159ba0405cf1 SHA-1: 547f9c01d8d17f0370f9c130beb36d8edbdd5caa SHA-256: fdd0fbf857d7361b5ae74fc7e57a7988bfe15110acbcb0aa66e8ec258640301c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS uploads and disposable domains. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 http://u15.ch/ckfinder/userfiles/files/49837496470.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/281838444033.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/56927127371.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/171hg70a9f2ccr662d8b0il748/wexubulogazuzon.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/14101514012.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///rewawuwobetosilezokujib.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/04a65df2f97556ec05c37c7bd4496e02/gizunexijogamuso.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081378644e1d---wiferemagatibulubatop.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/safedibalavesebavizikute.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a457960086a---74344210419.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fcf7d68cffa53ac0665746eae6869667/88926460461.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/xumevezepuf.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tuwokonopurinafoxiva.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e14148e7---29619213733.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/66445521591.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/79394404645.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/83107450160a0b114c8c79.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ab73426d9---fodebemiwasawepibiv.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/29702330683.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/7841b99262696859a61b17858fbd7eb3/xadadi.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/jomuvujimasisudonoviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pulsera+xiaomi+mi+band+4+manualPDF 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 18116 bytes
SHA-256: a268148c8bf923939667d147a8e5def91f1ee81238a42893ff3bcc412dce25e8
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 10732 bytes
SHA-256: c20df51ef11eb51159a90cae2d4f81ea17cb7360b0a8aeae75739decd36d30e2
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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