Malicious PDF — malware analysis report

Static analysis result for SHA-256 469f909d75ca92f8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 00:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94fcb3044f00f4b8cf95acad5e902f3f SHA-1: 2b641319e11c80daa361114282f2baffd45b1f69 SHA-256: 469f909d75ca92f831252ecfbc1c4e30e0c9748c223ba48ecc9cc48d5b884eae
204 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, some of which point to compromised CMS upload storage, suggesting an attempt to host or distribute malicious content. The presence of a visual download button further supports a lure-based attack pattern. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • 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 http://ephtour.com/FileData/ckfinder/files/20210901_C7F2962F34DC9862.pdf In PDF document text
    • http://karinameal.com/imgdish/files/memebosamizu.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/jarofuvobewixoxupatigela.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/rivuxenogixewojupufidona.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/mijawelurojolojixelo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463958ee8d8---43282353767.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bdc0aac87e42b7191a998918dd28c4aa/62403356076.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/79553801213.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/kusenejawirij.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/94015260658.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/2373391064.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/81496159754.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910143820132.pdfIn PDF document text
    • http://bienbao.net/uploads/files/gidomiwujuzokuseza.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/vetadisugakexi.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/nagoxofalapiwejosadenesi.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/nazavamajifiga.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e264401c16---sulijuren.pdfIn PDF document text
    • https://codecs.ro/images/file/95219288630.pdfIn PDF document text
    • https://equalland.com/uploads/File/nijovurorelunakoninoned.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/57631143451.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/55a31dedabec4ba8fc11f146aab66ad7/25532775563.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6tm8rl10q6uh792p97l7c92fpv/saruneduvixozefifebul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=subway+surf+apk+hack+downloadPDF 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_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 11000 bytes
SHA-256: 11b9146323815f7c43215064906475554e94f12763fe90df59634932576de96e
font_01_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 17408 bytes
SHA-256: 2d9d6b6e823936c38b577736488c56341c581fba4c2d5444762b1034bdcc7e81
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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