Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c82e9ddeeb44b…

MALICIOUS

PDF

89.9 KB Created: 2021-07-26 14:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be4674c8ad3d2ca9be50d565ceccdc63 SHA-1: 0de8ec8922299e46ceb9bd95ac477c964b1d968d SHA-256: 5b1c82e9ddeeb44b8c663d2f7197a5ea33546d4a329e99e9285af56312c3adb6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The document functions as a link farm, directing users to compromised CMS upload storage, and includes a heuristic for password-protected archive lures, suggesting a multi-stage infection process. The presence of numerous links to potentially compromised sites indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082667a2ee55---xilebenuwanigunoriz.pdf In PDF document text
    • http://kompletucetnictvi.cz/files/file/bekegukipunibaxi.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/fobufigapasonisalus.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8cbc2f668---nefigepedefitedusiwega.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/98661762984.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92af2799f5---21257733268.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8a9d3c29---rafubojamezew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c5e197b0c2df1eef3b6999cf2ddc263e/kokuwefatej.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27475651481.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/lematikavegidixoxapakasal.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ec289deec930a536beef0fa3489e36cc/datomafewetel.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/80553841121.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9e335058---80615723537.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c63c62bcfd24a0b7b07d5de881bf4a70/82748589425.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/28656657276.pdfIn PDF document text
    • http://hrudolf.com/userfiles/difexafikupuxaxapiketola.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/41990507536.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/30106224612.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97ac9e017---fozirixib.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a689e23b21f---42179113184.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f6eaeab7a3e6f61982f00aa4d383f9cf/72368085775.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/amirj383o6mkehtf58rpprk5nr/bekuxefar.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0ab8419f---nerokozigogasebomiviraf.pdfIn PDF document text
    • https://icbacademy.com/upload/files/jaxivekajo.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/19960169657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=epson+l220+resetter+adjustment+program+free+download+zip+filePDF 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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 17692 bytes
SHA-256: c8ab9abcf82fcbafc25aa31ec1f27ea096c037bdb7553af2f6b102bc48b63ac7
font_01_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 11440 bytes
SHA-256: 0d6504fc8a5573eb8d84daf722184aeecbe3fa7a7219861f3f616882b82e9984