Malicious PDF — malware analysis report

Static analysis result for SHA-256 207e4a56dcfe2c47…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 15:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab2667dc27e048f955de46b6b4ee8340 SHA-1: 6e156cc16e05d40fcd04c49333d60bfbe6b8ff0d SHA-256: 207e4a56dcfe2c471f6e4f7823f5a8de4cb3ae5c583b472ae189fe9180d2200b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. Heuristics indicate it's a link farm, likely intended to lead users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=hof+bonus+collector PDF link annotation
    • http://sun-tes.ru/files/file/24991993045.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/timeworobizujo.pdfIn PDF document text
    • https://digireg.gr/upload/jogopivigoxare.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/74056702888.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d0d19ce7---9705586250.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/dafaloxiroz.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/zuzixovo.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/37437807361.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///73381054990.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210904011548.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4b76c183---bedavivavo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161364b2e020eb---65759563242.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/vidab.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/niripusokuk.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ed7fa079389af3c1738a8ead065aa17e/6393568989.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/mojunewufu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/48319059774.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2eb95dfedc4db331658684ca2f2f9753/pelirufemizunewujajutolo.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/35530409418.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/61135120453.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95bf6f212---14757717238.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/71017892096.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/lodageradedasolu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/muxojiposeweravom.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/webofide.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/40988264216.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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 17000 bytes
SHA-256: 3cf27ac655a13102818f7bfeb553f829b679bfb6814af92cddc8ce69212b7848
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 10308 bytes
SHA-256: 9552880b560f6988634bba6b5c3888aef83d96601a3e1a5dd4f9c44dd014ecaa

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