Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0f619a563d8f44…

MALICIOUS

PDF

105.3 KB Created: 2021-06-27 07:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3826e22686294183dc7dce2925bb41cc SHA-1: 43adb2e155f77aabb3971ab5d91aac8e5f5e198e SHA-256: 7f0f619a563d8f446d05c5862879d4b34aafd5235a50c7851392c781fa04d6d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The presence of external URIs and link farms suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6feee616---zibijip.pdf In PDF document text
    • http://gemculture.com/userfiles/file/ribatupokuronakoxevuza.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/78661560885.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972afc84c4b---56944644801.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/19291219772.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3p26k7k974u4jtld19hrsh04p3/rupik.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d8b0a886---faxaxatexibavumutazojiza.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af53217cc24585072399fdc3d7a5fb0b/20971718810.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tozifuletuwelewozirabikun.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92b79e5e49---34907938555.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0f5cd79e172a63c670574d0f40bbc123/42486598140.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/rakupabulo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o5oltprphtdpvpshkgl63h6qv5/86573540457.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3bf120910856a3b5e2b18f9ed624273/wumulijakixetekew.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/64029035034.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/abdb4b1799adc5dadac269b23a7dc89e/70774452800.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/30648733528.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/db38e4996d1213203399f8ca2d114389/dasobofodupemananipe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ef1b08e1---vejatev.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vadobetawabesoxote.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082466439648---kumususo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a90b58049ad827e9b5a1882160b7f5d0/15106309672.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607beddceb346---titazuxazuweluxewob.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6cf7a95e4---zinaporij.pdfIn PDF document text
    • http://orderkai.com/uploads/files/govowamamimexarapiwudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+activate+mob+spawner+in+minecraftPDF 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_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C9 10880 bytes
SHA-256: 0a8fbe2f3769b6bc61749875effda8abf915a0fcdf05dd965f575b319843896e
font_02_sfnt_off00016ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC0 17116 bytes
SHA-256: a4caa15c0f3856b89b9abd4b1a3f4b9ed7b6eb840ca154003a3c05ab1eaa4a96