Malicious PDF — malware analysis report

Static analysis result for SHA-256 18936ff9599c394e…

MALICIOUS

PDF

98.9 KB Created: 2021-07-08 03:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 787043ef3da17160d3282f9f937a1f60 SHA-1: 41430b76e0dc94e77338ac986a01bdc5bee9c6cd SHA-256: 18936ff9599c394e32c2e9ab82f8393424a991d286da3a561955ef04f242cb40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The presence of multiple distinct hosts and UTM parameters in URLs further supports the hypothesis of a coordinated effort to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://smidgel.ru/uplcv?utm_term=lab+and+border+collie+mix PDF link annotation
    • http://studiogaleazzo.eu/userfiles/files/63495255313.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724386e5189---momagenajevudibupararawa.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/24907118922.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36018fd4e---96066340098.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/22208581491.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/kaduwas.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mdi2b26ls89j2ijupq3hprhcq6/56273389582.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/risepuberote.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070700415173499.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/66ffa2b401fb8a4e0d554d9eb762f69a/gijudowuxuzikezilaj.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/zovenusimibaf.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/52f89dd85bf72b9052acc957d9fdb4fa/87820687688.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224667150602.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/4910d195d58153bf3ee92fd4eb5c1422/nezakexejoritipovimokapiw.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16070846977381---81477582990.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dntjlbq4the1c1tb6ihtoj79m5/71208082780.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/migiropulikem.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689d0e3ac2---tofewubamoditutibe.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xogivojoreduduvalu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/028be985ec8b9cb00afc7b9c5ea4d6d6/lanovogirekudezetak.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e637a0b0560---nubupexubanotuza.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ihgok31ch3ajpf2ug7a6upfm52/wugadagerizelotevu.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pajubinukowufidof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ccc24108e---sarawelokeruwazegad.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/49586896847.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f02aea866---27122079616.pdfIn PDF document text
    • 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_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 17452 bytes
SHA-256: 3c12e2d15d94f8f1811458801ee447af2aaa1337f7c844b2cd5bbf29efca79f7
font_02_sfnt_off0001666e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666E 10464 bytes
SHA-256: 170ec591142e7048cb2cf0e56c117666a1b4682d3026e1fb0b6f0558021ff38f

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