Malicious PDF — malware analysis report

Static analysis result for SHA-256 b220fc63f8285bba…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 06:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55e5416bb56962188c4edd72f9551eef SHA-1: aefe1ff77d3e9916b89581c211d2821be8ede688 SHA-256: b220fc63f8285bba5a2e6862831b53381e27dc48b616732f5bc15c55c14be96e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous heuristic firings related to external URLs and compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the high density of links to potentially compromised or disposable hosting suggests the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=what+are+the+different+fouls+in+basketball PDF link annotation
    • http://xn--o79av69abka850ab6c.com/upload/file/202109132248096461.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/divekakojitusofufi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8fbfd8959156c2765c12e74ca2c2fb2/dotuwetudofazosetugeju.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/99708003562.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b54023526---31292398275.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/menerigejuka.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a2b31a4c1b54dc692e04a2a2d7847a0d/xonesibuge.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109131215592751.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oa9dfjtvca83rc7lslv5imtnp5/musupobutekiparomoge.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/xejajofevuton.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/3472748470.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/58056521089.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/12739681875.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf246d52c---vebebud.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/35758039932.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/52605128761.pdfIn PDF document text
    • https://rajakedua.com/contents/files/24470121229.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n97v4u5g3jjb1mm55ocadqs543/basovisalikumoro.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/84566216477.pdfIn PDF document text
    • https://fong-cai.com/upload/files/zesuvapufurekipen.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/pibewitetomusowelevedamub.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/mililolupikufapevinoxitoj.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/sekamise.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_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 15820 bytes
SHA-256: b36e2c18da558fece3928f362656b7dad2d4fc7ea9f137656fb5f776ebbfeba3
font_02_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 10776 bytes
SHA-256: d8ba7fb6f13a21847e04c90e027515333c94d99109211afe6cb3c3dd444ee14f

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