Malicious PDF — malware analysis report

Static analysis result for SHA-256 773065f1e8b28cc1…

MALICIOUS

PDF

100.4 KB Created: 2021-09-03 13:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8dbe4f261f400b8a5bedb6c69551cad5 SHA-1: 55684d4e955e1ccf6cce7a9d6c82f5633d69544e SHA-256: 773065f1e8b28cc16879ed488ac3bce4a1ad97d6ae33ae67d86ba5756d6d9e58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal One-Time Confirmation Code

The PDF document exhibits characteristics of a credential harvesting lure, specifically targeting multi-factor authentication or one-time codes. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing infrastructure. The ML classifier strongly indicated maliciousness, and the presence of MFA lure heuristics points to an attempt to steal sensitive user authentication data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=bt+hub+instruction+manual PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f2a9a42e---75079851128.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cjt49dt559shl7110ltmrr5n5l/novuzuxufokonazilag.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be8358a459e---3060606111.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16119f22b0dee5---59459610816.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/14683609854.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d7b5c066e---sonatudiparonafome.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23298c2c6d---fofijebidojezilakoxax.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/vuzam.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/85141559811.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4193b27fdd1185ecc65a60adea27b243/80691481116.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e9p3rt7i94ivonns1nt6iukals/vibaxuwere.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/82e22bb21e1f3ed191bd5602ae1335a2/zukopufomizubeko.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3790bcdd5bbbf69694b7954af497b386/61530249989.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kmqs2inm6ed8g9vl2obpeh51o4/gidaxobe.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/goruse.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/17509087597.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/65595449953.pdfIn PDF document text
    • http://gistys.com/userfiles/file/ruzudaxudakazudadan.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/wutopexul.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf63b02ffa---rifabimazofenodilof.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5184cf08e3---jasabaze.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f7c779c---1102106913.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/remorisebudilolamez.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf8c7c1f4---kumopokunedad.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_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 10656 bytes
SHA-256: 8743294f98d9e298f488a80b4168d7bc7b417580c94f77434bb79666f7143586
font_01_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 17608 bytes
SHA-256: 464f6c1187ef16872b8a52416bf39bc11bd077566a2f6dca75bbd6339b95e587
font_02_sfnt_off00016bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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