Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5add23210c3b1d…

MALICIOUS

PDF

124.2 KB Created: 2021-07-26 05:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5f2a4a80de6d1762c63d3cfe6cc81a5 SHA-1: f4a264572b8957740f64811f4052c322b6c62508 SHA-256: 8f5add23210c3b1daf76cffc084074f0d52243e4c533ec56f9106fe73f90d8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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 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://clubesquilacoma.com/uploads/files/25229964400.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb31b0c8b---75733237526.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67ce4b1c4a---61173729314.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ed28165a7b062b34f73324c5a3af17f0/perixuvivupugujulidik.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/xizowerorobodomikorawuge.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609427126fbb2---robinu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/50807500202.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/67203394881.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/zisowu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607376daa8c81---toterot.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/33745096207.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bomorogawagoxakerut.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210509205947.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/fo3gt7aqme2tb4o84o0shr3t7p/zulamir.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/39180658787.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/xutubakudutujubiz.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88cab8b966---koxufulorel.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f27d14dd3c---12430531880.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81fa8538a---zemesedugujew.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/jugurudojoxegopolixigis.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/54528738105.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f1bb79360---tipagoladidizivek.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/dexexemoderipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=peaky+blinders+season+5+download+filmyzillaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5E 3888 bytes
SHA-256: aa3948640dd25fb0a1e2c04b9e7dd240c9ea9e0a321b8904ac6297b7af9ab65e
font_01_sfnt_off00017e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001965e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1965E 19476 bytes
SHA-256: 53567a2aae118a40f5e7d9f8e23e7656edd15bd13dde2ada44f46acea330eb22
font_03_sfnt_off0001c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8A7 11044 bytes
SHA-256: 012b6a02231384d86fa132dea5513c0fa881477837ea98bb53da1fe66b0f5f1e

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