Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5fe86b631c4cdc…

MALICIOUS

PDF

93.8 KB Created: 2021-06-26 03:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43d1068f0e6d344244cf36bcb5466039 SHA-1: 305f31c516f98a2ac771a7c717abe066bed08bcf SHA-256: fb5fe86b631c4cdc9862a41b3a4bfd62f7d87fd822f5edec4c9fa64aa2e1ef1d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://acecaalcoy.com/userfiles/file/liwubeditaroduzida.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/msvg04q1fmao9dm1cnt6c5raib/bagemadapozigusugesufolip.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091e1c249cbd---miwobitidupapazafifege.pdf
    • https://123natura.com/stockages/files/katasariremumiraki.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3edb03e0a---40475302758.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57604c8911---kuvopepifiwipi.pdf
    • http://cuboni.com/uploadfile/hong202106221734143207.pdf
    • http://bortran.com/upload/image/file/20210516125824.pdf
    • https://actorconseil.com/files/file/saseviwidoxe.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac04335023---gurisibubovedewulixu.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cb1c7d7b---2332722145.pdf
    • http://bmcnx.com/userfiles/file/rimokaw.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c55e9644e---wikotatoxeruroxezebo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16705b9b0---2266410415.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/132cd61fcfa0306203e1c7d0237fb3a6/kepafoz.pdf
    • https://srldirect.com/ckfinder/userfiles/files/palupegomib.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/jigibaxojuf.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e822baae09---vugagebevivu.pdf
    • http://geologocarmignani.com/userfiles/files/renadezeren.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v8itas4h2ro33be7hfravnvcs1/95308217303.pdf
    • http://bularz-auto.pl/images/userfiles/file/6921524371.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=starlight+drive+in+showings
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16792 bytes
font_01_sfnt_off000123a9.bin
6300da6a15ecdce268aaa5ccbef5623a0344b3fe3c9d0eb14939f70223c38374
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 17564 bytes
font_02_sfnt_off000151d9.bin
81d8678eb36c789851ec3b254bbf4ed1e14c4df23a36662f52c3b56ae1ece756
pdf-font-stream PDF embedded font (sfnt) at offset 0x151D9 10752 bytes