Malicious PDF — malware analysis report

Static analysis result for SHA-256 a322903d3e3b6dfd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 05:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa2ffe952650100cf2332f71c58a9891 SHA-1: 5572cb1a0155a83fcd88e476514d80a850027199 SHA-256: a322903d3e3b6dfd2f610c5aaba765a5500fb04b18e0a3d53c86680322d281f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, but the presence of a link farm and the heuristic firings point to a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e490611e8---juvoro.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff505ee9e---xejilesoloxuloxixa.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34687496696.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210904_EA84A829F2AFC560.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15070184279.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/70952272420.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370e7eeb74c---21315403823.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62769648984.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/legasibixifozuneseni.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/79656515369.pdfIn PDF document text
    • https://bnovum.hu/downloads/28666394489.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/8942287454.pdfIn PDF document text
    • https://tekmaker.com/upload/files/61521210206.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/spik54navccfa91am68pmitltc/fopawe.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/25167291727.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/48181456481.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jelenenelavelu.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/vedozagizib.pdfIn PDF document text
    • http://balone.net/_upload/file///xogagefafisebagabivat.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/32413133404.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e4185d14544d8da7500670b1229e9cb6/2783646611.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f360db5844---52293603710.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/zudifamo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/sepuxe.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/jitogimerudabujop.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/genopiwunuxinakoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=used+to+and+would+exercises+pdfPDF 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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16224 bytes
SHA-256: 869597a40a06d40e7b2cf15bb67d3b75b5979d0f36a51eeb1572d90d9ad4cd85
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 10908 bytes
SHA-256: 87c508a470150d90cb484b0a3cd89ed8509b507dc193135ec8685386a78e4a4e

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