Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae4420c6999374…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 20:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c4a5b8155b406fb720f7219b3bf618c SHA-1: 11e44ec3ba7e77eed176f412d12ce8d694b87129 SHA-256: 98ae4420c699937477c70c8cf93bd022f316767b867f712282512830ad95462a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the nature of the linked content point towards an attempt to redirect users to potentially harmful sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://brenno-tojestto.pl/userfiles/file/xisosifara.pdf In PDF document text
    • http://ryukatsu.com/userData/board/file/gunavagiza.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/77364614955.pdfIn PDF document text
    • http://robedecreateur.com/img/files/92930937619.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/livotekijuzutanazipufi.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/15274788149.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/pidujafefegubupajebajam.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/81157767342.pdfIn PDF document text
    • http://fxlcd.com/upload/file/192070095.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/91765292704.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4ac584dca911a817177a175ec34e2ba1/terufaxirafenepufita.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/wuvituxarabow.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/15279505299.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/17242628237.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613daffdcc116---1206658860.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/jozovemubabatupasetude.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/garirorazagudutuf.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca6fe4478---zenojasirem.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/81876211739.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/subulomiposamam.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/84501881549.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/finoduvovelananar.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gusasifawo.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/18423547864.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/75326117925.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210911_131030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=civ+6+mobile+apkPDF 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_off0000b465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 16432 bytes
SHA-256: c069d9def6d203ad497fee081d34c8b6e16b6e3df21b9135c3b8649e6103a68a
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 10440 bytes
SHA-256: 7c121e9d6d6b479bd816d50d537729be8f7f996a5eda781c6c0e6ea349ea8197
font_02_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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