Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e784b5b423ec87…

MALICIOUS

PDF

171.8 KB Created: 2021-07-27 14:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e6c3a5a9f9d7ddff73845698cdb0de6 SHA-1: 702524288203f938842519bcd3072305b9a45695 SHA-256: d5e784b5b423ec870e50e090cb847812eef947f49a6e26dad747cbac36d5ff1a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9655

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411ead2f9a---kasemepolu.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/74856596005.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/notisakoxabazilazeta.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/zuvilutulo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/1d4f2aa9b2ad2f1a1ee2a0618a906988/83731721942.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tofixo.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/fumozijigop.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/57004475448.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ca58ec36566073d88d871f4c6fef92a5/zinokibibope.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f696da006---48722169861.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11510a475---61816727293.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beb048e681---rosowu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160df63fe5e9cc---felarowinidiwedetat.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/pusunomexulezup.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717686e3d71---dekosegalulawodatewepibi.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/19021331918.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d5059a9f99dea21dcd02cbe1bb57b273/zaxonejawawegusadeje.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc2f36b7a---40977077861.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/97120448172.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e6603b00---nuxanadi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/modezefa.pdfIn PDF document text
    • http://change-sexy.com/files/files/xowupezuvifikamonotijazi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4dc7bfe45a0b883eb76d821bed7bbbd/34797609491.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9077995217f334a88ed83f752f379d89/revuxafoneselomobin.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/308e75efb6ef193aaf17aa896e24618f/424822109.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc9deb95eb---1210450776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=john+deere+261+grooming+mower+parts+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BE0 23320 bytes
SHA-256: a9a5e2b7847d82765543f38eb2ba64e81686d287661623e517b90bd7a4791f76
font_01_sfnt_off0002646b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2646B 11212 bytes
SHA-256: 77d7cd7b1736a97762e695bb9e138689d1914492ac8f81120826a00426305dc1
font_02_sfnt_off00027e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E7E 1988 bytes
SHA-256: 6b2f43824ad5fa079027f6124f3a4ec13044ba9b23b509f2df3d09a54c1bd94f
font_03_sfnt_off000287a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1