Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac2ed864af71945…

MALICIOUS

PDF

87.0 KB Created: 2021-07-27 22:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d70064aff5950c365db3ce3bc3ee23f SHA-1: 0bc7e579958033ed36b23786fe07442bc1ab2b99 SHA-256: cac2ed864af7194517b21d537ff2cbc7a949de0123bde6df74e25297277ab5fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and point to PDF files. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of distributing malicious content through these compromised sites. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bc3064da07b5d62756c661dce670ea2c/fopib.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae318d6b8e0---pekomudafekafaxuzilalanug.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xolovidifalofamosoxadopil.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9b979eee153813f3719a73f0e7b9a50a/xujumoramaboromozetosava.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5a76df01aacfee1ddbad42d12b9e82c0/katebasunafaza.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4bf32f88---rafekux.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/fejudot.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73d9b264c---vipuf.pdfIn PDF document text
    • http://oodow.cn/upload/file/210720162425455952kmyxmksu4ecz.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9722c289ef---takaluvapemikabuteza.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72509ad64---kizarimifajinif.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee949826d---vutinofaniw.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4144a0eee180b1fe319d6970c8c8c750/20656241180.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/98518319213.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e9b2ada3---5024072176.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/zebuvi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed12eca0db---gojutebibevasuvovabuj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b95efda57b77592c66747b104b9b436a/kogifutozisogubiratuji.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/pezap.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/mudelagivelimagirut.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607da794340ea---vuxuragam.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g8iipv46le7v5mf841a5vh2nsj/busalivebu.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/253014897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=raja+ki+aayegi+baraat+1996+full+movie+watch+onlinePDF 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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 17792 bytes
SHA-256: 256037a48d7e45d174cb4a4f3ed32461a928e2aba270335c7e8fd6cbb8fe7284
font_01_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 11776 bytes
SHA-256: ef957c5144f501bf18c16589becf5d20d2b39d24ee41ce8bda0318d49915a356

Open this report in the interactive analyzer, or submit your own file for analysis.