Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26c63e2d3190616…

MALICIOUS

PDF

113.9 KB Created: 2021-09-03 07:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adb4c6e5ff0015ee53da689ac8f914b4 SHA-1: 5da89caee5facf5848f61966a9a6a79c380ed2e5 SHA-256: e26c63e2d3190616f71036403087b7af059fef471de5174871b50b0f87022293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating a phishing trojan. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or download further payloads. The presence of JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d3f4b58f2---wawituwutaludoverul.pdf In PDF document text
    • https://virtualpulse.eu/UserFiles/file/69742033272.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c8cc9f9a---sulixosidakidevepa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160909f9f92fcc---22416067780.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e550c2889af---melaxupurepuve.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/2620911487.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/zumobisavudozig.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110352d69322---tuleginilimezolenubokit.pdfIn PDF document text
    • http://kleiberit.ru/files/file/75410630868.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afd10e84590---pewaviwirex.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64e758996---milolegupubavakuwaj.pdfIn PDF document text
    • https://avflash.nl/upload/files/xanoniwuwatirel.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/95030625682.pdfIn PDF document text
    • http://wawa757.com/uploads/files/51367920816.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/1b75222ec18a062b095e7fe12f388d85/fatejimokis.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f73951cce9e---12321755265.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d1d04b3f5---18919244598.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/82361707783.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/43353810576.pdfIn PDF document text
    • https://samowar.me/userfiles/files/72355101169.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/48843376768.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/fazaroluvetenitu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/99031468415.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/30223880709.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d6f6238120e5d806f8f9aa7162ef70d/25967421665.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/niwolok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=yardworks+snow+blower+operators+manualPDF 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_off000157b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B2 18776 bytes
SHA-256: e412bba176fc0ada3579b3bd8675a0ed8800847f10c1ad26390d53cc9101a47d
font_01_sfnt_off00018868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A07F 10864 bytes
SHA-256: 443d900a7d6cd2498d1fa7b1edf84aa9051b9f70e9276ee03c6fbde933f697df

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