Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3946c7c590643fe…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 11:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a272ef3465d2ac7233b95819654e5969 SHA-1: 3c0f5e1b92bffac1b15d4fb0a1ac8cf8c9dbe1e2 SHA-256: e3946c7c590643fec84c9984b05d562676fbac37b7b7d3e5b52d5bbe90fddc20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many with 'utm_term' parameters, suggests an attempt to manipulate search engine results or lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=descargar+juegos+para+ppsspp+android+iso PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58b07dfcf---7584134655.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161451f4be61ff---nodixipikinepodidurizurir.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/fibenofazikutuwabutos.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/pokumizutefedopefafu.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/wunutara.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/40435987257.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nidovalubif.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf6f81ce2b---30036021739.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vusejupiduzemuzo.pdfIn PDF document text
    • https://sanagustin.cl/files/ferafazufefiliwepofepak.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/wanotexepafisubidotasadof.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/82675998690.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa581484c9---jimumim.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/83bc27068f15c0674e5370e3dc263db7/9605329160.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/gibolevat.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/vobudoguru.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134342a43897---befalesolik.pdfIn PDF document text
    • http://mebco.ru/images/file/61744021887.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/tigori.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/71047294740.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5ac82fd27---worukuviwavir.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/tobivof.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wukedopudokesojaj.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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 10776 bytes
SHA-256: 8bec219f38d12c1d29a794d3804b4dfef8b653da05c513a62a621340343b4a6b
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 18112 bytes
SHA-256: 5108a09ca6e3dcdd9b4edf0356132b2c4484a2e36f5289a6c079bd0c93026a17

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