Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a81612d2669b49…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 03:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10b3880226e8ef21decb5ae49b90ab3d SHA-1: 2fff1ecb1f6571bb2b56565092ce6aaa5d51f4a9 SHA-256: 69a81612d2669b49b062cb7f5c607586a442a4bafbc0204ab18d9da9686c26e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/130cfb045763de1f5763c4577b5c3a3e/lobulosalegovu.pdf In PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/88965139952.pdfIn PDF document text
    • http://ibb-online.ru/f/file/38854314625.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/709ba1badd1e9f17782ba51c9a3f33d6/jemeneridivatixaruzonaj.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/bf4e27281882cd9ecc302df2c46f84f4/88083633018.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/6370086798.pdfIn PDF document text
    • https://maisonforville.be/documents/file/duvakeso.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/sixulisaxakili.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/fe2a12f5e67270098711f0ec3cae7cd0/30026176922.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pj3im2a6ua0pkt8br57ghsk3c2/jolusogozojogawujakemari.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lefisavomagevezejosomovar.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/j5u40nmbvg4i28ruoi4jqe6ns3/46802939719.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/14455384439.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19a222a62---kapupo.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/25011151801.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/31ef33ef2a1bbfbe156400ca9d742366/newanudif.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/acbbe9499fdd7fdf0cab7eec6cca479c/36693270823.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f263864ab044c24387aa5382e005fa35/14137743399.pdfIn PDF document text
    • http://nensi.si/upload/file/xoxonorewod.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/xutidugevilekidegopuwepaz.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/ritotuje.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c138ec2e---dexalibuwixafudoxalegopug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=middle+school+the+worst+years+of+my+life+plot+diagramPDF 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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 17280 bytes
SHA-256: 5a63cedc887f80b26e1a5170ee55ed0e8a385f5af5ffc6e6895d956f4cc41d82
font_01_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 11156 bytes
SHA-256: 73e952774b73f48f5b6badff5999758770ab3f8d692a71cd764ed1e9fe9b3572

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