Malicious PDF — malware analysis report

Static analysis result for SHA-256 8855593fd5cb70e5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 03:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d51e46d7a0126f16c90076241229daca SHA-1: e00023aef6a9c40a0a5aa31cb9d76ad882a82300 SHA-256: 8855593fd5cb70e5afa23bc236bd1c3e61582545cb8f74ec413697e34ada673a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress upload storage and disposable hosting. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=leviathan+wakes+ebook+free+download PDF link annotation
    • http://cyc.cz/pictures/clanky/files/levetagawapudanatutiwo.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27910551419.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/94538123040.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/mipon.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d54b7e10f2102815b10df423fcb89600/wojorinowanak.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/18994416541.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/76044888812.pdfIn PDF document text
    • https://jobtiara.com/files/files/4969226693.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/xaxuzokamoma.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/gavufel.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/pijedepotebidegomoz.pdfIn PDF document text
    • http://citranco.com/users/files/dekiju.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/gakovivozulur.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///tisudemeteselopa.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/17057815686130a3e5f1de4.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/25606403913.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/44699031771.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/40638031118.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/95087296652.pdfIn PDF document text
    • http://tavio.su/files/file/47183341512.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/fuwawitizomepipati.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/80639692699.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5e1af89a73dd5539712e8973706c2149/poxavuzimigibukuzadamatax.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/defb4740852810bf632800f91778b443/bisizagarijugajetamun.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/82283625828.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/58958309838.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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10792 bytes
SHA-256: c4d0361185003af802a97c39fb9a37a47791039c145416f27188e0b8ea0fea3c
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 17220 bytes
SHA-256: e73b97b9097961870f61c6e12c038e14e82b20beb84dd7811f6f3c0c8d158bc2
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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