Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee883b58a041b748…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bb3d39cbe33f63d505908c168246440 SHA-1: 6661fee6cb0b317786d7b603fa921d2ab24f5776 SHA-256: ee883b58a041b748015a61cfab3f0112aec94a32a614de91ceb7b6625724a852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and external URIs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fobosgrunt.ru/files/ckfinder/files/luzedipinivadupe.pdf In PDF document text
    • http://www.39koratmachinery.com/file_upload/files/wagumosutawal.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/viseba.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15245808b---31798233043.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1966e123---lajupenufamawekife.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/46192053997.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/38103456804.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/fonadejopetiramibaki.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/lexovobopipesirawazipe.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/pulefugisa.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219121645406003.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/nesikoborebulodituruzelen.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/22906461114.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wugerem.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/26291203165.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161416bbedf467---33753071182.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/46444764153.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/wafafimazirafekefesuja.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/nafik.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/xopewovelenotufaz.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/65438265280.pdfIn PDF document text
    • http://vipdiler.ru/files/file/dexijagujosad.pdfIn PDF document text
    • https://bdata.vn/upload/files/jusuxisi.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/5307947785.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/30062351980.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gokixuwokamozilujuzel.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/19015238509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hp+slate+21+android+updatePDF 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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 17772 bytes
SHA-256: 72a4e38d04c155775806a4d12dab43abbe1c10ab465bf9459ecc074f8a726dd3
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10648 bytes
SHA-256: d4d7c9a74fc86c6beb6e9992bd0f660bcda5af09348c426b04af997d11c1a25e

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