Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15097c9eaab0b05…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 02:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9789881900f4d6ad941e288ba6e423d6 SHA-1: b5d6428840797eff9615a5feba2233515e362b28 SHA-256: e15097c9eaab0b05cd90a95ddc2f68ffc95380b1a4e856cadc2b731f84403be1
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains no readable content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://markone-tools.com/upload/files/86015673750.pdf In PDF document text
    • https://charterboatdeliverance.com/uploads/files/25567277887.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/6938938774.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/93008389616.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/63991246802.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/jekutatukuvosexis.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/23414126120.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/nuvefosidinoguvarofaxude.pdfIn PDF document text
    • https://festacontinua.it/public/file/36259386307.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/36962493459.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/25167291727.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/puvek.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/97566994178.pdfIn PDF document text
    • https://swiz.eu/files/editor/42197030649.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/84220916758.pdfIn PDF document text
    • http://profstil.az/userfiles/file/82209281353.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/bc7bcd676a39cc1efe76bc7720d2b843/nikinagowarezolesubaluf.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83ad53c25---guxidobomikupaguvilulepoj.pdfIn PDF document text
    • https://31app.com/userfiles/file/87754019253.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/31754567582.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dikovegodanezoxep.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090202380718.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fezawi.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/gulijevirexod.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/386659b71ff1e976fcb1aaa956201f84/jibujunivaxowewubanu.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/14638076374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=noiseware+license+keyPDF 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_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 10392 bytes
SHA-256: 456bd15f7a3c842854e6c656c6127c8da518bdf4e13d56d26cb59a7f13ff99e7
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 17952 bytes
SHA-256: 4ca3c0bc271daf79b5b2d42bdb9a037c035fddb69e1f0cb5f3625218f7118dcb
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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