Malicious PDF — malware analysis report

Static analysis result for SHA-256 d883fbc200816bfe…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 14:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1bc8547dc7a9848b1455331fc7fb6b8 SHA-1: 2fa0b703272094e843d4dc0f4692026f4bd8834d SHA-256: d883fbc200816bfe7da2bad5808bf571d7100c4212bd3324c72902d283ff4035
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to compromised websites and potentially disposable hosting. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=stream+live+football+on+pc', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=stream+live+football+on+pc PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33bf041b9---18791956472.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/gigajuwufuzodixexak.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/50966516947.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/5220191168.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edc922489---tujunozed.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/mofelil.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/46152639393.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/35823467168.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/19463264792.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161327edf3698f---53708066417.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/3553322642.pdfIn PDF document text
    • http://falconltd.pl/cache/file/45376295522.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d9fcfa1426cb7e96b5eff9b8b85bf8b9/gaguxotekibudixisekepo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/94482372217.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/83654181620.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/dopedit.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/loxolegitibabane.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/kakipuvarezisilado.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mesox.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53285890383.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/nidatoriruwarul.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12683175669.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/totexotasogenud.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140efa3a2c3a---xuzukazi.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10752 bytes
SHA-256: 3afcc875a79bbdcf73cff2a077adef45165e8977f1e712a806cdf05b9436c6b6
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 17352 bytes
SHA-256: 55cca28decb5fcb058abb9defb76f4216d3107a6a2a298be56b4fa9b006aefc0

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