Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c2b9ee1852c2f…

MALICIOUS

PDF

79.2 KB Created: 2021-07-01 15:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 26f4eb743518c98a5c6ed67c08fdc4bf SHA-1: 9e69cd18cfee45c5969fcb33233e90bb64980d74 SHA-256: 3a3c2b9ee1852c2f30f415a356689dc5d586a71fcddd2083bbe83fa33786a9ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure indicates a deliberate attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3dfe0aec16883d92347b77260b00b238/dulamabezonosabopun.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b574bdd2b6d---70921234757.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13918c6cfb---lefibulabipofesi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a15557664ea---rutarifotokijowimek.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f10e3cee6d3f8cf633cd4b63a6157594/lufizog.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/52561658269.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/23983197761.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/tafovakura.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7539453778d2ba7bb1398f2aaa9bb41e/59046261839.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/51482419329.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58c505eb0---7123219668.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63e426fd1---pipix.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f83ba89f7---7608724680.pdfIn PDF document text
    • https://tomas-music.com/contents//files/84727259588.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/buxigosusomewenuxasek.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/53351149623.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/52e57c494c8b8a46e7a4a1ecb0a6ca2c/29518833379.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tamawiwa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1e977c6cb---xiputizum.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f75244d4e---rajuzowevukowogifuvo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70274831973.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/djtp008f5u8facrecneebsv6ok/luwasesefiwobesunenagopul.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/drd71csbmfim58nonah9s6coif/30135326831.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/lixipozonumif.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/28948194135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stairway+to+heaven+1975PDF link annotation
    • http://www.youtube.com/watch?v=-z7UTvE0-zUIn 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_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 10736 bytes
SHA-256: 95f0aac106ec2c2cbc6af83898ff830d95504a440cb42bc5262402d2ed06c1fd
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 17748 bytes
SHA-256: ac59fb93e31992f0e0ac3a07645b4569551c0f07e3cb1cc790a56340acece445