Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d075f6fdfc4f099…

MALICIOUS

PDF

74.0 KB Created: 2021-08-31 23:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d054e540378e093360e0fcbfcc992a1a SHA-1: 52565b593fd4eef1a9ccad784365cc1e15ab1722 SHA-256: 1d075f6fdfc4f0990980e4d6a18d5be2eeaced6a1099c11d98e5805259d27bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ambulatorioveterinariomariani.it/userfiles/files/rugiremaxodonesonow.pdf In PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e2a0539181f6cd0fee95e3aa3a9f6ee6/donoro.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/kudedojedos.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf733b9e---vojojololuba.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/dopidonebijozivebexeji.pdfIn PDF document text
    • http://huiking.cn/uploads/file/100331305855.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd4cdaa01---12889002369.pdfIn PDF document text
    • http://deforma.it/userfiles/files/leviretixovib.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff2e18681---54479567360.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f97d2d96e---fudan.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38339048974.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/5234fc8f0e49a82897525384ee69dec5/mudusivanufidavike.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/k3v6urlogghb3m9vcllq1p17nh/50968736864.pdfIn PDF document text
    • http://www.moyekolodin.com/files/72193201919.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dabcf9840c695ee78f39cff3c4947720/19139041797.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5gqvoarnn9lpl0jtr1eujnjq55/657215476.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/58918447301.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/mibozepes.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/545bd5cc04f0e89ba870e5ab605e64dc/66361204539.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/755b6371896a374151b652fb0e831576/mugokugemibuni.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1db4eeb7a545cf9ec409a917a5e7c954/44379041792.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/69020275546.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/wirawomigasuwa.pdfIn PDF document text
    • https://ienter.bg/files/kadikajivazenunalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=star+model+for+interviewingPDF 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_off0000bff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 16288 bytes
SHA-256: 5e71187098da4c3c8ba7ab1e09685a2815184d1dfd6889af4e07389c1bff7b92
font_01_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10756 bytes
SHA-256: f344f3fc5afcc2d1578e24b53b238cbb124eef26df62ab2c78f3bb4b03aae9c1

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