Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ae8275d871abbc…

MALICIOUS

PDF

92.3 KB Created: 2021-08-01 08:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b387d259b286bf76b30a95711d48109e SHA-1: 64671ee0734d686c92b31c0336421d228a7cb4a0 SHA-256: 05ae8275d871abbc7bec2b0ea1b11ff40b81eb7ef4e9bb0abf3f92606637222d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/uplcv?utm_term=is+there+a+movie+about+the+land+of+stories PDF link annotation
    • http://bakoca.hu/files/file/posetuzisuvadakane.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/mulerofofirekoniroliba.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/bimezomera.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210715_1F1DB2A68D067DD0.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cf92d4177997a3f1eb301882013361d9/82136344582.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1208aac2ef---doriparabadixukizokozo.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/wobixabunafota.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608743cb75d20---66659189694.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/8hsdgp50asbnnqqbfobi0r4k3n/pedibenuli.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c9c99b9e901b5d3424911fbc12edcf2/75482355860.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/likemunavef.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072f004180b3---genulumenumenepob.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f5bcc51a---9031935283.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608780faf1f33---45028452722.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4c97c376---91335557421.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/98864672578.pdfIn PDF document text
    • https://epiphanych.com/images/file/sumedibejojomesarudu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb63448121---50440728170.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/94752717564.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce32813e7---92857997826.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4494421e1---fetefuberazovivo.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_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 17816 bytes
SHA-256: edc23611ca62c66912d324f92b7e68d5023e0644eb83589bf54cfe95f58a7f13
font_01_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 10876 bytes
SHA-256: df3c78df5a90c95fed3de67cb29feee11d5f5ce8129f99e98849bf8c4a24d2fa
font_02_sfnt_off00014aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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