Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73671a36a0f2791…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 01:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d668328a7d98e388a6ecaf8bb56c8ce3 SHA-1: 2a6db708b7072ef14334f412894acf879d25dda2 SHA-256: e73671a36a0f2791a298b943f2aa9c28cce368d81779c3ee1119c1a861a461e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to potentially compromised CMS upload directories and a link farm on disposable hosting further indicates malicious intent, likely for phishing or malware distribution. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.nhabe.com.vn/ckfinder/userfiles/files/47237802426.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613967179bdb5---fodugos.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/17974735842.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/12439988022.pdfIn PDF document text
    • http://tercovci.cz/files/file/vuzopivuvex.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/osro5rvbc45ggkvng7dlalgd4m/zavexazizigig.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tesaroxuranaxizovedaz.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/44351299553.pdfIn PDF document text
    • http://insei.eu/userfiles/files/mejoxuwefexexutiwivaf.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/mopus.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/toriz.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/85709403168.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/sufevesorugawomozowababas.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/kajet.pdfIn PDF document text
    • http://innotack.com/userfiles/file/42338449953.pdfIn PDF document text
    • http://erdbau-rauch.at/15504775226.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/74785060306.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/riwexuvaj.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/88912890490.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/23001401249.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613398a34d714---janetibixoxekusaxipivex.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fegojibuvezejunezaz.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lexorimopul.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350621cbb5e---99499998379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=come+scaricare+pokemon+bianco+su+androidPDF 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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 10892 bytes
SHA-256: 6f20ac2f782889bc5d1910720a95f48a2638bc93f3cc6cc568b18fc05e1e0f88
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 18288 bytes
SHA-256: 636812731c3c29f66d53d9e908b9853ad85c4e6c6847852bfc71d473ed1236a7
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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