Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d4df8a9947e406…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 11:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5037e7e1ae1cb2e59c10e35f2ea6558e SHA-1: 66a78f81902f03ee030087bc818b3384060c07cb SHA-256: 24d4df8a9947e406a8ea18d595d6e9cb504624c697407d27453877a5c82a393d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites or use disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

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://box8websites.com/ckfinder/userfiles/files/33272014888.pdf In PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/11772854596.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a8f4d5505e589a1cd1016c551ec6d058/navojarowezerowepeb.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/zopinezafidosenibo.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/mubutigevonolat.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/18788172561.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/460192876.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/95580800332.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/bizizesi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/63909618713.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54fe106d0---14348098080.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b62744774e5---bexevizexazagalevusokasiz.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210906124736.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb24cafde---fapewatugosetilofibabelo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd47e1a38911d9e5ea9bb1e39a27935e/53947349427.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/zirevegudinin.pdfIn PDF document text
    • http://kezmosas.hu/files/file/36423681890.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f25c3ccc---84071489511.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mq7pn5h2s18kg3vleo5m34u1vq/35389831436.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/rijuzo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71884329002.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/jimodomutegoxaremege.pdfIn PDF document text
    • https://vientangluc.com/upload/files/puluforekuruwisebegokor.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/7s6ik7igi49aiiqkfs9fgt35mn/49620496488.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/88892864213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=attestation+sur+l%27honneur+h%C3%A9bergement+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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 19616 bytes
SHA-256: 45f57a2c6a42079d323c4d2eb3eda9963a26f5bbfb47ad0b659bcddbc532c4de
font_01_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 11356 bytes
SHA-256: b5ebabee7548056b20e5b02cf94479b427f39d80cd82b5ff364037b174c4d196
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1