Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc494156c3aebe38…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11ed990f79f9679cd2dc1ecfa64f31c2 SHA-1: 702fc8734b75600a862c95521969734ca69cbd9d SHA-256: dc494156c3aebe3887530a77a93381b8f3d5ecd56541aaeaa136ec4779613687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, hosting numerous URLs that point to other PDF files, likely for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true malicious destination through a network of disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://dishandspoonproductions.com/ckfinder/userfiles/files/pirudoxipipetiduwuk.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947fe9eaab6---luvoradidusanufewaz.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/dodejiwezuwapixaza.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/keliruxupip.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609488d32ab6b---66452310684.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mapuzibalikoforo.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/39514625179.pdfIn PDF document text
    • https://europartner2.pl/uploads/99051223282.pdfIn PDF document text
    • http://sdes.in/uploads/pomolu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5f4c86ccfa4b6424eb105fbc735d238/vivujotigenimazal.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c448572a6---xetuvelatasuloxini.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/tebogixolowajig.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///raxebifulujukezemiwojega.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tajijiba.pdfIn PDF document text
    • http://houselandia.ru/files/54521436652.pdfIn PDF document text
    • http://dalaichau.com/files/nilexivi.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dabuwajeta.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc0a3c090---67562682931.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092626031262---kelasuje.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nobamukodatozuwi.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/95382277224.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71929458f---16171302648.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/78285554342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=baby+moving+between+contractionsPDF 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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10988 bytes
SHA-256: 8861a6c5af6139547915cdcc4a0a995d72c8f3f53737d60683447b5f30e3bf9b
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 18300 bytes
SHA-256: 321d8c079accd6e9a9bb2020898cf41072bfb21b8934018a6c01e9a230bd6db4

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