Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ffd1d6148d0a3d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 22:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb4b76fa8d693b37baa86edfd19a12cb SHA-1: 840cb5a2d86d56043d23f6efb3ae443225833b15 SHA-256: f5ffd1d6148d0a3d1dfd676c586b0173d770ec9db441d256f06270ba510666bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'mobile legends bang bang free skin apk download' term indicates a lure for potentially harmful downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=mobile+legends+bang+bang+free+skin+apk+download PDF link annotation
    • http://soles2walk.com/data/file/59533395269.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/30007462458.pdfIn PDF document text
    • http://interconformity.ro/images/file/39474812447.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/63997323023.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/33095777242.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/zalunosurizokiwanuj.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161354e73ec0a5---71365320076.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/putedu.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/roxazozobepematedep.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/pebimemajozogumowamaxeko.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/tiluto.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/reluliwudi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/38252277355.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/dusuxutumagimaxozixivuwu.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/93006987287.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/lidunulokivoxifodog.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/polevisonigexezat.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380d04334f4---45066682592.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vavinavonar.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lugitemofevijuke.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/34361264241.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/romotaguwosevopuwitog.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/majojefekuvimaxorumufekop.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbb5d9075---91373263505.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/jaxotumebojozol.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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 10888 bytes
SHA-256: 156f7e0a174722469f7a411511274a624ff640bd66ad9e4725b9deac4dba077b
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16984 bytes
SHA-256: 5f4bea64354205a83f9e056e604bc14521da35d238ea05d922becfdb422d95a3

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