Malicious PDF — malware analysis report

Static analysis result for SHA-256 e460ea3385fa44ea…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 10:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfec8b600aa52d3c76c4efb9b2eca2b6 SHA-1: 0b92b7185a7873bfafa2dcd9a2a8f14f50415874 SHA-256: e460ea3385fa44ea15a7bdd9561f755a94a5b135e5088b25b80780ed437dbf9d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary attack pattern involves luring users to external sites through a deceptive PDF document, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a1a4982b4b23b7bfacc6546ae6240b09/2520000189.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ferojivolipiterape.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/sibamuxonijutenajikabo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/wakovib.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/13842917930.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/7334339092.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/13842486170.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/revan.pdfIn PDF document text
    • http://master-vin.ru/files/file/xizafutudoxuk.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/28003752537.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161336651a647e---mexuzi.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/19842148475.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/89662987825.pdfIn PDF document text
    • http://kesifveotesi.com/files/fawimojibane.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/lifituduruzuvil.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sosovasozoj.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d30bd28c---dotesigibovugomupepegoteb.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905142359182407.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/097b724aaa66bdce67c896aeb2bf4019/10108179985.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/35088813867.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30bra2ktdt0oltsqndq1eh0gs1/70493390598.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mebadunagebu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/44629348097.pdfIn PDF document text
    • https://coil.hk/upload/files/11991933644.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/furerusulasilewurifupejut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=antutu+redmi+note+10+pro+5gPDF 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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 10748 bytes
SHA-256: 4a50b336e5c3f96caee842d758cbb0b1583cadd607102694767300a71bd73e73
font_02_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 17352 bytes
SHA-256: ae6d20905d0e915daf93812f283f31608ed5c1f199d0e0239fefed84804947ec

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