Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a4aeccec32112c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 00:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd91f08a38552bc8ce1bc3056da2b346 SHA-1: fa41345875234df03195b6c1e7018baefbbfa827 SHA-256: 17a4aeccec32112cbd9015065a1b4fdac4b729979d1be8e57f88e97fe5980c04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. These links are likely used to host or redirect to malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=watering+newly+planted+emerald+green+arborvitae PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea8dcaed8---33861415017.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/vuwituseti.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/vogitisat.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/finupozekenulazoxawenok.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2230c87856e795ab07a0fc85343b4c9f/96389539799.pdfIn PDF document text
    • http://scro.ru/pic/file/10610107425.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/52387305878.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/sonasenel.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/db1627e89344d1cdbaf6f117f4dd32da/zixorejuzulozum.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/tavomowabatosuruvos.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/danis.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zulotafesuwixeran.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/bazovuwibesomefo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/bodatovatinimiloraxiza.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/38829712661.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/muvefav.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c060523b948a0ed6dac42e6e9ba8ab92/moled.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/5459919781.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442f5d9605---zigavevafadorumovusufeza.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ui3sl4dhv3ljkvnf954qfl4re5/20330692556.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09e1c02c2---jasegefazaw.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/0469589e7a33c2fc944d2a1b2598e1ea/51886459723.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6125009fd9---74200324562.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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 10964 bytes
SHA-256: 796ec939af6e3213646a9fff12b29570e49d522856fc0530672955d80630ca7c
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 17844 bytes
SHA-256: 82a7ba76fd6ba8bab6ce8813fdc8e668ee6720156f2e87c5326e736272b67fdb

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