Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d1db1f18b48e09…

MALICIOUS

PDF

97.7 KB Created: 2021-07-23 02:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c52e3bf7098860a6826875c81334ccf4 SHA-1: 9d76a30264e669e15e29b1e9d25b329953ad0598 SHA-256: 44d1db1f18b48e09907662bd70adc4d041f688dd0894513c9c6931b3ff31ad22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading further malicious content. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b75283c49ed---kosumo.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ovc0biiu2a5na253uji3os217k/lalipubolubijobudaxa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af36ea347---17532927947.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4392f6b3ea---zewexusufu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e61q7uh2o3jc2igij5lmp4qk1v/12610685622.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/xisisixuniwak.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/fuvofagudetuzalituw.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/97c72mfjddtrhl4gs5ujqc6973/jotemubijuwesumosejoj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160895cb2dffcd---90900161532.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/74532900630.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/af3dfd1f3d473bbf09560c2d4e72c8a0/molewixelegezuviwo.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e4964b2022331c586e19e7e27efb7ff7/8257920234.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/23362617031.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/gotafizopadizenoved.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tisuputasu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/50a4fcd2635fde900d6c2bdc8b3068d2/lufolukefoparinibe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a497cf78fd2---48062734469.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/58008486201.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/guxirubafezunupudufekij.pdfIn PDF document text
    • http://capital96.com/userfiles/file/80194698154.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fq927p3k38ev7t7oklb9k7k2ca/67125691477.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3593aaf3d2---xedajegefekejudaxotidoka.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee1783bdc---27034333673.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6371f68878fbb05dee598c944b7e0917/ruxowuwaperuz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e29430b6bd0---makalazonuzizifaral.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6l32lti7feqnk3oa53g5cvd241/18217201846.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/79686370886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=extraction+2020+full+movie+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 18184 bytes
SHA-256: 98847ef69ce60980490c789ab36672f362c1e26b4f0c845f52f9a12eb83e1a51
font_01_sfnt_off00013be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FB 11276 bytes
SHA-256: ac051f6ede07c27d6b590e53103afea8a84e21ae030454ac826e09be9b047157
font_03_sfnt_off00016e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5F 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb

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