Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8ffbb4c3b77916…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 16:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bb890f0a71b6aff0619bab54c4b7f0a SHA-1: cf7c86a2c19ea1443624e4ab7816221824e5682b SHA-256: ae8ffbb4c3b779164bc2e0d15f3c00a0442d7c6b1d94ff6b29225d8fb5706a10
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be distributing traffic to potentially malicious sites, rather than containing a direct exploit or payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://fine-cottage.ru/userfiles/file/35751096201.pdf In PDF document text
    • https://33mobility.net/uploads/files/tefizoxoxo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dc41483a3---sijen.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/23656663106.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/vefulibanab.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lururawakobete.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/91044383309.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/20371278974.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679e9ae4a7---wagijonipubuvuwujivikup.pdfIn PDF document text
    • https://hirurgija.me//files/netulinasuxusi.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/lusivexuzojavogotesatu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/39669101718.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c157f2879f3---32925460800.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2af314bfb---12969078934.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/pixokojavox.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ad3457389e0c750c6ea52a13feea2f3f/babumuge.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/81130095207.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/59368557119.pdfIn PDF document text
    • https://hsse.cl/files/88874531942.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/tufanagej.pdfIn PDF document text
    • http://kotolantopeni.cz/file/visuzej.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c3abb0d---80154064437.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/8457997490.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/poroguvulitefilamanowivis.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/siwaziwunogetamepifodepo.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/13471161443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=arizona+month+to+month+rental+agreement+pdfPDF 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 16540 bytes
SHA-256: 4ffbbcc0fce2a07528bfad889681ff8208356ab11dff74946739c59149523401
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 10820 bytes
SHA-256: 3f5f4ccd91af65939d95481ba3d1ed66d92f42e2aedb19c32d586fda1b14887a

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