Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83145f4741fe52…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 18:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1825950cbf0a12f062251440292e06cc SHA-1: 6c2bdf216d1e54739f318569d1adb5ee4c6bf769 SHA-256: 8c83145f4741fe52b5424d82a955f0a232ba005650577e9aeab1f4fa2b715e30
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://diamantina-joaillerie.com/ckfinder/userfiles/files/pomiduboragivogitodis.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d0227aa1---pibugubexepuzexaw.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/54137463066.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be208aa8a17---42230988604.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07168eaf93---54022348138.pdfIn PDF document text
    • https://latework.cz/soubory/wabeve.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dc94024ba95cda317f7db349ed8910d1/10698917598.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210725_0A437CC2FDBEFA49.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/kitesosode.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///sosop.pdfIn PDF document text
    • https://vestol.bg/files/file/88176553898.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/fedulokimu.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/95903352649.pdfIn PDF document text
    • https://cargobull.cz/res/file/vaferuvekogamipofagogepi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pedigidelo.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/95934472571.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f9d1b592275dfb7c5158d8e16f9a324b/77262105545.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/dogozojerowipewajoxawewod.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/72771921178.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/327b53dd7a9ebf46a0c5996e9a085641/bufinanexugu.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/dijuniziripe.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/geweg.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5iu766vkkfb8fkcbqg9fbj4gg2/begimopefakipepapetebadu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/ladilirokojagewitiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=balanced+occlusion+in+complete+dentures+pdfPDF 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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 10936 bytes
SHA-256: 49ec55e6ba5966d0dc020efd75588d74efc8ff60a94c1bf3f257246247db9f7e
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 18264 bytes
SHA-256: 928e63a62a5ca0ba5a539e036100afb4122326e93cc6a07a2478dc903713e482

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