Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9d2acb95b375c1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 17:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45088ca9b7a3bf299e8d41f5df845ec8 SHA-1: 5b753d0c89419306586b7f05efcced3074081c98 SHA-256: ac9d2acb95b375c1768adce7a1968dcf4750d44641c50e00cb40433897839663
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of multiple external links indicates an effort to redirect the user to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 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://crisismobile.com/ckfinder/userfiles/files/88120507670.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c124b1babbe---zizemun.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/2976e6fcf7ba8d4a4389b80388e2e631/20843325828.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/27262980879.pdfIn PDF document text
    • https://starbox.fr/img/files/53468955686.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/dalone.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/kafevowef.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984314e4325---mesanubedurerizasonu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122f0ea07a---16087319686.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/v2da82kd4ru0ig6t11s1pksmfn/fuxeloretoxez.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/wonezi.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/rifafinu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea8723b74---jevaxanakelug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089242579ea2---97904611929.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/80767929093.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35f99a2ac23c83feba8914877fe0d846/30022202041.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4fh93f23r7sfqiflenp4at81q1/45633175066.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/forikuj.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8472113c779aa0952dddc7bbf260e2d3/makidawipajawonafowulojer.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/50897376018.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vumefoturuxibudefefabedo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880736b5a3e---55535029358.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/470900e4600df185694ead3cdb16f76d/35683671339.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612775343c230---45716546373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=traxxas+slash+2wd+parts+pdfPDF 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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17644 bytes
SHA-256: 5893259d9425bc838a9135bb67b6a9680a637ab45719078591a5671b53882cd3
font_02_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 10416 bytes
SHA-256: 5485e30a2b8ee8c9f1fea1be4c54d9acc926b2ea0c8d0b5b0d746d77f2497edd