Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aa8715195d5952…

MALICIOUS

PDF

90.2 KB Created: 2021-08-16 19:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a51388ffe6f6d877adcff97d5f614701 SHA-1: 44663102fb7817e0b4f6758d965f9f77fbfc2e6f SHA-256: 19aa8715195d59520d70ae3fae3ac9e8f5e9914f57f2b649a07237c28a265cda
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, many hosted on compromised WordPress sites or disposable domains, suggests it is designed to redirect users to malicious or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=convertir+de+pulgadas+a+milimetros+formula PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/33414125539.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956f342213---71329065142.pdfIn PDF document text
    • https://alohasafaris.com/files/fufulododozazu.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/62686623606.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/db8856c10ddba327ccb4a5f59ae6735f/xibogaro.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/524f0fee1ea11973d7fe659698090b6d/xarazupujuwopuwegaledami.pdfIn PDF document text
    • http://bakoca.hu/files/file/18231316569.pdfIn PDF document text
    • https://steammining.com/userfiles/file/19659327534.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/nufigipujijuranawedunekib.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/236013b358221065162005f44be2ca53/15190226776.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/xajixomejokumimutun.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sorulerumupumejebop.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/31639500234.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bovivobenap.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210805132943.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/zosakitozamerefiwagar.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/taxigoxozofufonu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/97776e39db1aa0a2a5b96e0d052c5489/zimeso.pdfIn PDF document text
    • https://everestart.com/images/stories/file/kikedixivutot.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2eac57f6---bexatutotexukekenagakagij.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5df749aa81d997e6b33bd21d0b025a22/6164449628.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/velirasuxasopavarapexi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84f2aada7---pavur.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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 11036 bytes
SHA-256: 556b7dead5097872eaa3d1681a72cd9aaf255e91315cee45f7095e4c3dea1d81
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 18416 bytes
SHA-256: 6f06afa69a3cdba8414483d95f8e959ff00984943e947de10d7be339690832c7
font_02_sfnt_off000142b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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