Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9d3fcc33eb4804…

MALICIOUS

PDF

114.2 KB Created: 2021-06-30 03:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b124593a319f0bb4e2ea8a5010f922f6 SHA-1: 89f371c87d852a0fc4c9a43afcee68013ac062ba SHA-256: be9d3fcc33eb48048e8d28656281b19d4740fe4d823f9e983d810eddef04fe1b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The heuristic firings indicate a link farm strategy, with specific rules flagging compromised CMS uploads and disposable hosting. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a721chabcnb6do12j6793d8gk0/tejadakevox.pdf In PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/gigenuwijukejavi.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/4ad1e31e60602291643036b3b1982921/maxopifokuposokide.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c88bec688b6---70303263515.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rh9kjqa8d6pafka76u5jeok6c2/xalelenukononilirisa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e940815335---vakatewupijewijefog.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/fabovobapetironojopag.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f5ea5518f1af0503146ef06726b365be/8396090355.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c415fc84---zefudopenikimaxibidi.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/zevipopoxevuzuset.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd669be66c---poxerapobubovonik.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/veloxenomitesugovolaguw.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/21751213383.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///38978435632.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d52d7073973---fijoxurujefavigogaxir.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/27126364619.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/nilevodedafemi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3f0c6b16686729ab4d1dfa6db0008e40/83905202309.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/bunigosawolal.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1725a04f6---1592916013.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/97e33461c492320d76b46bcf65db4c07/xajumusigawoveganaka.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/gijuzemaxuguvuxelenaveten.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/iecj4udu3k3rj7rfk8ssld8g2v/12837985129.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e02b1d02b143dae781273ca8dec5b1d9/25661368308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=united+nations+charter+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_off000160c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C4 16380 bytes
SHA-256: 68a39396c06a24abbfc677fa722448b37819e394edc186437a1549a282ee3044
font_01_sfnt_off00018abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABF 10680 bytes
SHA-256: b43bd2437e3eef436c8d12efe194541fe41ce311b7bc4086485ebb2627bcbedd
font_02_sfnt_off0001a332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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