Malicious PDF — malware analysis report

Static analysis result for SHA-256 3147e248e6721d91…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 07:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dc028b5e20567a3849a1da1b76eddf4c SHA-1: 4d8be7efe21da447a2114da5179ac04d46753924 SHA-256: 3147e248e6721d9196119c01feaf5d7feed0929290fd33f8d0802cde597b76aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=computer+forensics+tutorial+pdf PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afadba8a880---56977384085.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31184939560.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc9c8718e---sarozefumuzafo.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/49278046615.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb4102e10---vosoxufekemigowitone.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/konifofe.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/81713474466.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/litobokenenozabizebupun.pdfIn PDF document text
    • http://thietkewebseo.com/webroot/img/files/90280781042.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tji216uvci8hrl35l77htvkhd2/xajokabitegigilexurudizus.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d87f19a8---nivek.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ddde345df---37815800606.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/dvplurtuqf4im01kmt1v2dh535/vujizesuxanabaxazanobefig.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/votobubutaxiti.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/84705280409.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4be018f0b8f4cd1fd346df34a070a31a/fumunifibigu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/188aded1fdc905c4ab2e62998cd09c4c/lojowozimev.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af80bca135---losizu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99794c1fae---84734999991.pdfIn PDF document text
    • http://abpaluso.com/upload/file/75060126281.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc6bc4403---mavowivuvifove.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nkq9jterblau5f8mpqs68psuv1/80933842839.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/78578fc9cbf13b4881301e6896d85e2f/bogudubo.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/16710289162.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/20609316868.pdfIn PDF document text
    • 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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 17232 bytes
SHA-256: 078dd830b55f77ff832df73204ffe3c0f6e12231d870d9c6e3e904155eb47cb6
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 10912 bytes
SHA-256: a11aaf53f09876445dd67bf0a39195aaaba1154b62048ad4cf38d75592fe831e

Open this report in the interactive analyzer, or submit your own file for analysis.