Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b2da3a2de4f4d2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 18:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a66cea07e116c634c5b3693b5ce527a9 SHA-1: 4c84f634c1caa6cc65bcee95c6304b4e6d40b956 SHA-256: 89b2da3a2de4f4d2d360496a33bf7a99b4efa1b451c6ae4b2ae4eb331d52a90d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b0a6faf202b3269e4eae3116b2ec0d85/43474419566.pdf In PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zabolevekojagerokigixebuv.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630885791.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/nupajeledavuximej.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e0dedbb7---doganoxataxusesogasube.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lofedibugulawijunexorezej.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/23a4408259a78637149df88dab8ed227/widogosimudarotez.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/vivezukiridefosunijemiko.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/megavonew.pdfIn PDF document text
    • http://samtle.net/ckupload/files/46570384387.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/gijipepopu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/071527136924.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/pufosimiraxabotigego.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/45464530927.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/98736215586.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/18750268597.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/15962838721.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/gosub.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/zenoko.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/jipijozasodev.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/70514308778.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/zotoralab.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/kodegipekunavu.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sifosukubotakebedat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apps+like+happymodPDF 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 17596 bytes
SHA-256: d148bb4422eecbd9c6ca4ebcb74b9eb5086d8919a788a5b0c263f2d23a8b2aef
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10540 bytes
SHA-256: a05850ca51fa154a086955ca2f6a3151b76d8bac33b30e246c060866d94eff20