Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ade5dee573f98c7…

MALICIOUS

PDF

85.6 KB Created: 2021-08-30 19:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56149434339631b1f0a036c167ccec1c SHA-1: 554169f75196f9685040e903da248bffbd4836a5 SHA-256: 9ade5dee573f98c7b1ce06051380f2974955e6703771f18eaccf55bfc1c320a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9cc3bb073be01fe0a10bb973bac52e99/debatavidamogawurovepu.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/498f97fb352ac8de0b844b6b5d57e287/45195847810.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/9378639544.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/77087536312.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/lemedomef.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/winadutudifazunoxisi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9697c0eaadee02f30983cbc37fb856e5/tifit.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7ik79rmpffq40ekdof9sb9gopv/73370215159.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/28080949009.pdfIn PDF document text
    • https://le27.fr/docs/file/mosonegubovakivowiz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/09bb003abba57a132b177320e3c51386/69543329543.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/weser.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/rujofulazotisizinu.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/piwanura.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/63816123675.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/dejugelesovi.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/rutodomiwujunulab.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/604c7c2af3bcfbf0f48251087ea53743/vinusegitinuvupata.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51b3448125d9067448e2995b38a9e501/pipewukufo.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gejezoniwilegamov.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a8c2347ee---48359985337.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b740f592---21741852687.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6493781a23c8324b0ed662e391d81a33/65154017325.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/36126380280.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/tenusixigerazudumul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=injustice+2+mobile+cheats+iosPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec28c6ceae5bce8da25f111b213286cc/tekikosizibeb.pdfIn PDF document text
    • 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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 17700 bytes
SHA-256: f5d5bd1c79a5b782142cdd8817784a01e7d61654c2ee8122c9d09aae4dff74ae
font_01_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 10836 bytes
SHA-256: 89f498be544358111ad3fe7e45eaf1c25566c381cf2ef7600c30d9263a37f6ae
font_02_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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