Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a0e81addfc50e…

MALICIOUS

PDF

99.8 KB Created: 2021-07-31 01:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 255d596ed16e1a2c062edab1c6174e25 SHA-1: 0ddb46a998d69687366eb8dd5f911237ed9bae01 SHA-256: 404a0e81addfc50e4242cde28adce50f6950ec7246d528285079209a2aeb735c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f583a596180---88241691223.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/dd5865cd41f7fcb2842f506a5b08e544/bosetedujukawo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/lupuzekaxig.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94d40b80b2---fafiruf.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8f72dbbb---riwore.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mujupulurozovupugarawu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcdb0c959a---paparunalumaro.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607662023591b---51520861500.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352e2d4cbe---divafenunodivisizezaxave.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/58812b25f11bcb7bbe21a12bd9330a10/kegowijekopakopinevu.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/96862961381.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/92200025538.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210511153841.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/35367116890.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/vuxonesobegopivafixajuz.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/najinewejopa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609859e69ce82---25013058941.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nuoaarpao8osc6543kivjej59b/xagopekusejubizoxaxizeso.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e682155ac1---7360388200.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/99821529711.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/julukebifetatidori.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/fasajonoloxewozo.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/pajanubuwisebesofetapeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=la+se%C3%B1ora+fazilet+y+sus+hijas+actores+hombresPDF 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_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 19260 bytes
SHA-256: 4de5ed607b78fddb158095f0a03b9c17497cbc1a9601bea1c71782aa0786164a
font_01_sfnt_off00014c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C13 11204 bytes
SHA-256: db82410a6db5653cc5e9a2a58ef14afa0d1b05b9fd5e55a551cc518cb58d7c03
font_02_sfnt_off00016626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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