Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8a4bdaed22bfcd…

MALICIOUS

PDF

79.3 KB Created: 2021-08-27 20:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fa3eecb323f67926ab5fa37c1544a84 SHA-1: d895fa4343fdef68a74e7b0cee9e2705deea70a6 SHA-256: 3a8a4bdaed22bfcdd1e5c49c6bc5d63aaed26ae12d08f86639b008455fce944f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nature-revive.org/files/file/27209838748.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210601210842284091863.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/xezuzofovazefo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca74a19ee5---90878214362.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/beruwodusawotuxokasebuv.pdfIn PDF document text
    • http://www.grifin.sk/files/topono.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6d5adc206---juxanufozefodatobigavix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cab9e66c10c---20719744890.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/948473ff43393477b3efb76ca36d6ffe/lolipuzigosugoriwozigubok.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/refesediw.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/vonowitepowanumo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5eeb8f1af004be3b94ebb0ea297c839d/40490988286.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kizivaravavu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ktirpuu7rfdct1ej0t42qdcfvn/zapiwukudukanotimubo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4155b1050e---24498344547.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/viwumufelibagamiw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0359abf0dc---weguxugaziru.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/gekunefavorotusijugoson.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/pilokepewinizikotuza.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/kiripebonijevujukumogexod.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fa11e1644---21503697489.pdfIn PDF document text
    • https://migger.dk/userimages/file/xobexatojimipufupedewe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48e08074e---50258825431.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/balitiler.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/vibuvagewesi.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/90462270360.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724839f2a03---ritevifugita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=beginning+algebra+worksheets+with+answersPDF 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_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10756 bytes
SHA-256: eeba00d8f2cd3b4610bcec06cb63bc389125c004ed73c80fec8faf7548c21ee3
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 17036 bytes
SHA-256: 7755b817a16c3f115fedb6b28f01f8aff0a4cbb56c9a4a1bd2d7e5eb7c7201ed

Open this report in the interactive analyzer, or submit your own file for analysis.