Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb62112e817b1dfc…

MALICIOUS

PDF

93.5 KB Created: 2021-07-09 09:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a4de63e3d05fc3883cdb6d7286155cd4 SHA-1: 4242664f4bb78f9c906ab531f4ee7f0dc670373e SHA-256: fb62112e817b1dfcecfd3de2bf626c186e17d538cea7f5ded46a5b8a99591062
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allmassage.net/upload/file/20210513110010.pdf In PDF document text
    • https://curvy.tw/upload/files/lisikinalulux.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/1948861976.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/62825895416.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbce99a50a---tavejimubekuzelu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/196d66d16cd83cf6db285f1961a3b73a/21726315763.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/sarudawiduforinanaxa.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad062f88---xedarebizobo.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/loxewejenajuro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af7000f76---62864438031.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/eehicc1buun9murje0l9b2g4k4/82395844774.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831a2b3d13---zulavex.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160853c2d0519e---xonafuxijetafup.pdfIn PDF document text
    • http://modero.vn/upload/files/witepasiwiterosaxesoler.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/baxetexejedufekogakudu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd86667a85---badeboluzojinazana.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2a0328e3---39106717552.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52858789a1---73275326249.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/09cca736b210875cebba0390cbcff4d5/zibidexevibijaporemeweve.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/wolezusaroseme.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/kisuxuxoludumozigufo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a720be913---josofujumisami.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce8a17145---94718820141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=easy+animals+to+drawPDF 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_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16928 bytes
SHA-256: 9f4e4e09205b270d4d91932ad49f3eaa87682479e3ac272aea0d6976cdcd4764
font_01_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 10460 bytes
SHA-256: 3454ea0d7d4c2e82cde3d8b3568b3b9264a2412e33bdaff4fe913025a3429bdf
font_02_sfnt_off00015119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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