Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd10727bd3b22c9…

MALICIOUS

PDF

266.5 KB Created: 2021-07-07 10:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b001255ab54441a8409324a95e31384e SHA-1: e7c0073946b43b91dee4145ed6e068eb6b12eebe SHA-256: 8dd10727bd3b22c91d32ac81f18a5d08f94bd7e234e10088bc605158a96c152e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, disguised as a free ebook download. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates this is a common phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to deliver a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/78a8955a9666243531c0cab6791df771/gatakigorenodoworum.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afac8947194---23159328498.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e048107b548---sitojofexowogawexosuti.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f9b7c625998ff068eb8bda1ad9d79e2f/69418374786.pdfIn PDF document text
    • http://hnspkjx.com/d/files/sazelinenavefevedeluluk.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/41136677382.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cd8400ae4a19e50d27f796d700352b26/fasagevada.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qn77deh0m6nfd29ne6chpmfos6/ravogovix.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2499724c74---pajixelugegupegutaposobu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff2f6ca466---bimazuregobuwisa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95a5e6574---8085646217.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/gawakugusezaledul.pdfIn PDF document text
    • https://music-group-store.com/upload/files/8535868557.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/dutirekujuvavisixa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a967ab9fa4f---99811829249.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/kjgp7b7hlhqo3psb6koip3dbk6/8406406885.pdfIn PDF document text
    • https://scriptdd.com/_file/file/62458217004.pdfIn PDF document text
    • https://banghenails.com/upload/file/jevopudo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/palelitup.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/20598646061.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ecb197af4135d77b4b356cef6e668ca5/17239217393.pdfIn PDF document text
    • http://51www.org/uploadfile/file/54f0477e65434eaa208070ad59050650.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piwazerinam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+room+on+the+roof+ebook+downloadPDF 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_off0003bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BB27 17668 bytes
SHA-256: 5a97a27106c9a3890aeda18bdd9b4d0cc40537c6c55de4fa4d0c36bf704e3d64
font_01_sfnt_off0003e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4016E 10640 bytes
SHA-256: c3eae2087cba05f71bcedd2daa061ab602dc35b1d0a8d2e047695d309843d890