Malicious PDF — malware analysis report

Static analysis result for SHA-256 e415af4ec2ca303f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 04:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c02aaaa4b5fce44c9d28392ed93f74e2 SHA-1: 6cd10a582459f4a9b3a44be7e6487f76a3a966cd SHA-256: e415af4ec2ca303f2189b9ccd73e7ee6fcdf41f502a9a0822a7139ed49878c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5cffdccff978120e280011ba61c393af/70748984390.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40e4b02ecc---71121325620.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/14421018600.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b243de377---ruxewusolas.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/91631906094.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/57377516022.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911a8919e3e---ruralakozokojixuxugod.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9f8932af---65306790236.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/69117607361.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6jv7qg6ms4v9asc7mme7sv0rv2/51613174327.pdfIn PDF document text
    • http://ctm.it/userfiles/file/gikebipufusijaguzukuv.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b61d2c1bdcc2a2ecac927259e1988be5/84612753470.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vo0hvhtehbcv9np5h79q92thi2/pifidimepepezopetezireb.pdfIn PDF document text
    • http://quetthe.com/upload/files/zusazufomiguzilemuliz.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/96456426528.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/xivawifesosasabenivoxifud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadfe61073a---81603918120.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/xatunefixafujewel.pdfIn PDF document text
    • http://normel.org/files/upload/file/lofojotimiwep.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228e65e77---fifumelipujozi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b016702a752---jesofimeb.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/12028084576.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/roditokefezit.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/44999517098.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3173060319---nizulezu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d268e1---tixaratikikeboxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=footprints+in+the+sand+pdfPDF 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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 17888 bytes
SHA-256: bbbf65888840d46c6d467e5801998eb0331ad5f73a65f46235126f4d5a928e6b
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10524 bytes
SHA-256: d7de41095e33b340c595bb3104a05e144a1b425e5e7f9254387fd13eead21599
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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