Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed990d0df6eb1673…

MALICIOUS

PDF

78.6 KB Created: 2021-08-14 05:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c7dd66002a2c65fe17613011dc34946 SHA-1: 9fbed8539321e43a15bc71921a174fb07e241262 SHA-256: ed990d0df6eb1673450782ce2a36ceec64d18208ec4ea860952cdc986a37d5cd
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used for phishing or distributing further malware. The presence of a link to a compromised WordPress upload directory further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://shoppingplanet.ro/ckfinder/userfiles/files/tipotunozapopunasa.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/74770729910.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/xukesagunuwufa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/97051842058.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/tokalemiwap.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/91081944351.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca24dd1def---74976705900.pdfIn PDF document text
    • http://prosquash.by/data/verepimogatutotu.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/72340901407.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607199edb03d7---xipexibige.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952a5e5888b---lanudavige.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/bc6cdf14c13be48ee2ee864c113f653d.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c734d6b776---22647904054.pdfIn PDF document text
    • http://seamacros.com/upload/file/xajawejamurawegipike.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/582e3c884cf11b9d0784f9241a882952/zonazanomefelusomuval.pdfIn PDF document text
    • http://szwygs.com/upload/didadamusupig.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/sobaferunulu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qgk4r7abiv6td9hp48v8hq9veo/49303211945.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/wajodaseloguniro.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4ae7a81e---58530963931.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xenujizanumagafeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=oraciones+subordinadas+adjetivas+sustantivadas+resueltas+1+bachilleratoPDF 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_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 10980 bytes
SHA-256: 5f5e47c88fd57db848eaeae2680cdb67b186704576ac3afbad296c87c26ae4ad
font_02_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 17400 bytes
SHA-256: 28bfdd8593088a7b5f786377bb3797ad65668c2abb295ec17d4e7f7922adce8b

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