Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b1479ae6bc85e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 20:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de3dee4fb68a94d1c9742995fc5e92dd SHA-1: 3c2db5d5a3e4001de84eb671f4aabb6a42c64d3d SHA-256: bd4b1479ae6bc85e3579c3f6ee00630e1ab9c751a38d606c2ec973d8b3ed98f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including a link farm hosted on disposable domains and a link pointing to a compromised CMS upload. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+watch+online+123 PDF link annotation
    • https://epagneuls-bretons.fr/caningest/images/file/pepukukizojadir.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vefarawalukebutomifedom.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1858bd770---98176213299.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/37766633760.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/kageri.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/gabarenififalenojomiziwa.pdfIn PDF document text
    • https://shidoremicrosys.com/media/rekofezigelenizapixokivus.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/nukulunoxarenowezuduzel.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/xijadujezixifusedowatovi.pdfIn PDF document text
    • http://teraval.cz/res/file/kakexuboloxuk.pdfIn PDF document text
    • https://afma.pt/site/upload/file/wikuwaverorakatokinaga.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/mutoxa.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/50057727573.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/3594070230.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210907205400.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/pepuvij.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/57754989951.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/11266934559.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/dolidafudugorotet.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/90473896388.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326cb84c273---96269081652.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/65621622830.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///42750843963.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1ef54b41---99084056454.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_off0000b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C4 19244 bytes
SHA-256: 67a1c04c7eb91fc7f47e58df061c94d77d5f8f36e96024d5a4f0b7d4f432b23f
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 11560 bytes
SHA-256: 8b63b31b8f4ed31d4dc049cc86c9c90070af979e171213152f11f341a5a6a7c1
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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