Malicious PDF — malware analysis report

Static analysis result for SHA-256 d813dd396edf7b95…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 19:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5a331caef4d700b41b052c99c256a8b SHA-1: 58a790d33496b7feb7425f4914b2305d61f981fa SHA-256: d813dd396edf7b953b4e4861f56a770b8fcc0de3c7834357223f79b240474a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=judicial+review+adalah+pdf PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d1a2d10ce7c06a2a9d47a47c95dfc879/fujepo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160913629285ed---zigixor.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/82952402916.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/beguz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a683b8130c4---42857200098.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/8953343837.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/fokepubapo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86aab1d368---melugegamiri.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071810380173499.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202108120608079976.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/saketujudenimirur.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d86a330b68---55497631038.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105c241b42---96218441803.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/37509907877.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/lebenokijekalivetelir.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/lewamifetonomivejesuva.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/957649756a6a549464b13c7e8c91a9f8/68412714958.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/98522484854.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/36331923899.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/juxosebadegubizakudewinin.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/88033442631.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/41114964151.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zokitizipifatokuzudevisi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/18102735821.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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10472 bytes
SHA-256: 639b6adc70513cd281d225e3cbbc60bd796055459fd91a1c50480376622d8c16
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 18668 bytes
SHA-256: 75c8a3689cc6405b14729b9306ddd67e862c02cb346cf72e8c8a340664c792b3
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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