Malicious PDF — malware analysis report

Static analysis result for SHA-256 101a59fd5fb66486…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 10:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 024c94a414df968882efff196f5c0aa4 SHA-1: ac941c1078e8355dfc65db2c1a97826c24317a75 SHA-256: 101a59fd5fb66486d39112475be64f2df09378730993acdbb3e9dec4e187fef7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links, many pointing to PDF files hosted on compromised CMS uploads or disposable domains, suggesting it's a link farm designed to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://safiorida.nl/operatori/userfiles/file/tekedug.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f452e10---nusurup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a6818820---rowasuzesamabituvewu.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/46708368154.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/44205569623.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/tufezememunez.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd02b687d---9754430277.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/96148339630.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tiruwo.pdfIn PDF document text
    • http://full814.com/upload/files/15235840294.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196d4bd9bc---ridamexor.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/gadununoralemexidubotetip.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/34799351447.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f76c7465a---92530532878.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/bivizar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399628c38f6---39937153020.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/nibusi.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/fasirapevatubosag.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd52d793d---dulip.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/xavagupukekataxorezove.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/4674989093.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/50203236586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=yeh+jawaani+hai+deewani+full+movie+download+1080pPDF 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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 19060 bytes
SHA-256: 722c3c475c250b688a1c250266fce86a7c6a3a6b0d2b02be834710c967170040
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 11144 bytes
SHA-256: 49cc90b24a873e9f1c166619cff78edd136377019bd27c19174ef9830bebe61f

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