Malicious PDF — malware analysis report

Static analysis result for SHA-256 8942d5567e428c78…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 08:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 545520693307d1af5088fe0a04333e8b SHA-1: c504033205c88ef46a6d916898cf6805288ccb4a SHA-256: 8942d5567e428c78ba80eb25256c62f45d5d07a95ceb1bfd4783e68ac1849085
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of a visual download button and numerous links to compromised WordPress sites suggests a phishing or malware distribution attempt. The embedded URLs likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=daily+thanthi+epaper+free+download+pdf PDF link annotation
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/mororagozilavi.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/70094100944.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/42253232947.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4fb422428---76504214165.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5177aa4340---vojugidujelegatijopekupo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/49553598462.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16115d9be20679---notonigofezo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd5c6911b---nedanof.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/72501070388.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/welunepajosej.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7380ecc0566f56d67632b0e0bc17ec64/newofezewarajutujoredox.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f1f50771bb08c889b33515b20328b8b7/jakajujabokupituratezot.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/mirugo.pdfIn PDF document text
    • http://mutitar.com/user_img/files/xazeveraloziruk.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160728a5d964df---6499863434.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/susujekav.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/37035583893.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/66800930123.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/tukutozifafirojawaf.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/556e4fd2b4e92d19557dd4efd94027aa/43496458249.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090511631c6a---73747747546.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_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 17000 bytes
SHA-256: c290af3f5d35c1a592937734fe3f5e2609cbbb9df7533ce892f7509448793ce5
font_02_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 10628 bytes
SHA-256: 24e12f9d44202b17a5822fc146e535237b669a13264d0585d4c680e4d951bb0e

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