Malicious PDF — malware analysis report

Static analysis result for SHA-256 52438ed876d0aec9…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 06:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ddf0ed234aa92d8269c409d1dd04d7b SHA-1: f90d5f29bee2c734ee55e38fd217ca16d7d330ed SHA-256: 52438ed876d0aec945600e6ab1a371820a99622980301e5336c67a486dc7efd9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492280204aa---lojexekejakulufuda.pdf In PDF document text
    • http://tfe-design.dk/userfiles/file/59717766638.pdfIn PDF document text
    • http://parateam.cz/file/mogis.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908141358947.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nuribewofejir.pdfIn PDF document text
    • http://full814.com/upload/files/sonijawajurazozaxixonone.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/40818637451.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/86183712581.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137ddbbfae---jenavanojejumirilojesuw.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/paxamorigelarisubudine.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/33254966278.pdfIn PDF document text
    • https://coil.hk/upload/files/batesinumujuranovo.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/punokigedarezomujixep.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dizepemerokomavazabuvo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/035615980f433d30fbb26b516f1efc07/45060172865.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/bulalawoxifakik.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/69842934195.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/20313517199.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/30013270dad90e489bed3ca52d9d0892/pininizisudom.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/daxojipadokimepe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225a5a71aa---gududidalijafup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd3e3d6e5---gatosudun.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/34715867640.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/55761280950.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/manazikixavesiwumezetan.pdfIn PDF document text
    • http://floramarble.com/uploads/kufawodaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+xl+download+apkPDF 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_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10576 bytes
SHA-256: f8e5d7c03545da23e2f4f202aca8fe6fe72aae3a7b327432a9a2aee8220bc2c9
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 18340 bytes
SHA-256: da769d75b5042497bc84ed260c7cf4cd29d1dc01541ce892350010d819ae084f
font_02_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1