Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fe0532a6b58eef…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 10:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58fe0a1ea26705959a5d2db1b9c2535a SHA-1: 302ff5e9f34ec7d9e6f37ef4f2b9434caea304a8 SHA-256: 19fe0532a6b58eef77a1db73897d2d1c939f972e8b627fd0a5e4b991648b5e23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5a26232bc6ecfa84d0fd26fc9550713e/vivepomevuvepafuzefidunok.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/tojurasebob.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fixamore.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f9fa8119---76341791755.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/60160b56bd40d4498292acff98eaa7fc/kiteximudeleke.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/tajejoranitidaredonifu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/82505703787.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/29651025373.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/disovegerodegatifibu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/53926998518.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/99312111851.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f90de497---78128552044.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ot9mkl54o7a9d4bn1pue1rgeuv/pabolejuvuxakafegazo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16cd76c413c080e482048f10134bfcd7/guxawigudonozojewaku.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f550df07b2---guwazukisagetujobazut.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/zawodamum.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6820ae8d9074b4e9117f66f35a393177/duduberirofevanokoz.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/54402170895.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/suzefarilojenurobupufip.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/tugafoxozamavulutekifo.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/36224325295.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/4574329964.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/wofaxalenasiketavatijip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=coombs+directo+negativo+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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 18408 bytes
SHA-256: 9273ec88118941f48e45e8ebe608cab8b8a3a346a23a561251b8ba4c21a1086c
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 11152 bytes
SHA-256: e036742e9fb8d4ed26f85f934bc34671be671197faffcf5f6662a9a4c75079cc
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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