Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fa36384b6771c9…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 20:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 349ac34fdcdf6888a19a11357b2ba794 SHA-1: 0d5e3ba0ed309fc5d73ee9d4ec33dcef85de0def SHA-256: 95fa36384b6771c9ce08718d168594a63e4c86e870963f7f9369e050a70faaa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=infinite+tanks+mod+apk PDF link annotation
    • https://baptistfriends.org/media/zapobedukinekopaw.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/96210234223.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143713ed0053---27233228948.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kofitoxod.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/xajamifalejivotelepewali.pdfIn PDF document text
    • https://botroul.be/uploads/wipawufemurizuwef.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/pelosasaririwitasowuvinoj.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/mujiniposikil.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/miwitamonor.pdfIn PDF document text
    • http://edituj.cz/res/file/60242246152.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/27500909513.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-12/20210912085441865475.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/9536719679.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tfsu1r09outf8qd1b6fqubeo77/roterebopa.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/totenorenekepemiw.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pitezokaxubunetudexajefe.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/20972980613.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/96379188663.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/9278812571.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/kazageziwosazalilu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lc2inkavlf7hg8sd2q368sk8gj/57849601557.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/67656206388.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/72744389835.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/lubawitibatu.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 16564 bytes
SHA-256: dc065c33d957551ccc20880af65f7376c92f9cbb858b235cdec48df94b8cf5a3
font_01_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10556 bytes
SHA-256: 414f57522e6337aa46fc2486ffdb5d8a922b9f276973f3b466f6d37c18f6227a
font_02_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1