Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c862153e4dab07…

MALICIOUS

PDF

104.8 KB Created: 2021-07-05 00:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd3cd3c69f44608ab455cae799cc3f0e SHA-1: 56795e5b5acbaba54a14f79a7a5cf629e7e4468a SHA-256: 71c862153e4dab07c534fc97234dc050733220ee09b5bad054f060ef3906aaaa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier also flag this file as malicious. The embedded URLs are likely used to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4n3arnothps89uq8c9mcneo293/popuwowekubokovisu.pdf In PDF document text
    • http://www.fonfe.com/uploads/files/bawewedixaporexezikasalaj.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606febe6bc21c---67863667079.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jadulu.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/64611111805.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/jubidodis.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/a0pp7pqjoci0e9hko5rd0girbf/korizirugarufezuzelonilak.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/52330101973.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/99326440213.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/57320993281.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a072c5c7a6---83639194351.pdfIn PDF document text
    • https://businesslife.com/content/file/65613909602.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/65a9887d3bc1b460fcc4515f5379e9a5/bunodarerifoxibana.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/59173322739.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4lnau0eiu38um4db7u0ln88v63/43602632255.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5ac564f289fbf596ba49048f3edb912d/kefonevunevuzadofedural.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ca36248a35b7cbf7f6635bec18315052/75452625129.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070627d82ca3---98020973043.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/bunid.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1bc2d1b88---96174259695.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4379b3939888f7cb363d511ec0d4bc91/judoxulomavaxekeboj.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ifhriq7ef4m4n84po2tghd57ic/kadoserijirodelinugovumik.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/vutebumufufuvizonobogevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+desirable+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001722f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1722F 19352 bytes
SHA-256: cf6cb2704860f1a7721a3cd3028aa894f024b1b38d7d6135e82e839bff5ea185
font_00_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10828 bytes
SHA-256: b670bad372c054e5e69c7a049e1b0ec7e93bcc0e83b79eef0cb051c576074b20
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 32320 bytes
SHA-256: 00d70219988a65891c6a7af1952b96a9189a282c04f61ea4c7761256aee552c2
font_02_sfnt_off00014aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEA 3996 bytes
SHA-256: 30758fa3c085973524530aab6f38ee42e85b1b07c680a668c026e8ec2cef253c
font_03_sfnt_off00015a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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