Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d31cc5213bed2da…

MALICIOUS

PDF

97.6 KB Created: 2021-06-28 11:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 68a31cdf1b031193f07b09d7cc9a4854 SHA-1: ad5f3fdf33db176912d98c93dc6362cd96aa0895 SHA-256: 5d31cc5213bed2da27996d25c19266963c4e22bd284073d1883928ea45f3bdc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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=how+to+make+smaller+pdf+files+on+mac PDF link annotation
    • https://alarrabnews.com/images/content/content/file/fepavusikog.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c53c8aeb4571d13bda69092598496376/pewudejawi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/69345149179.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd560a7553---bapov.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/acdebd8e89b72835a0ae347d95494b6c/vidazexogarovi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014838db8f---14742358321.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/latewetewire.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/xipisofaxiweko.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05871037c9---1438610042.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4vm77bgvq711idf6886s4faik/xizapixenukobuximox.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d8935041e86d2a0a605de88e3e10f5e0/51393807423.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/70647657661.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/23457666350.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051914022458.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/erko3dcsdn8ogl0ijvmi13uen3/lonijisisenazefuzubigoz.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/58318481447.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16082840fc6c6b---10449149900.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24jerk98ol4uu5fp83mledqpv0/84878313995.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b7c57ph9srbrpeoj2vt395kodr/biwewuxis.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/106d0fe899e6bdcb40587c9ccf230ff4/keximawitok.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949052742ec---9768694280.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/03nueg9fviisft816s228c4585/23351428944.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_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 17688 bytes
SHA-256: f8b7c478988e2356dec64186f1ddb25efc192ff95d24f406295c7a196811b471
font_02_sfnt_off00015ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFC 10948 bytes
SHA-256: 38c020685a70e76aaa3327070b3358327b5ec75f72f28575bcf4f84dd0ede62b

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