Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c24304bee07a90c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 06:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05c5ee69470d70ed65d8e1dfb2e319e2 SHA-1: eb14f3f7aedd3433ad54171d47cc67cf9e60bcd4 SHA-256: 3c24304bee07a90c38034d812fab44d84d9f5ebf4f62d2da3a58c12e4107d1ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on compromised CMS upload storage, likely to redirect users to malicious sites. The document body is unreadable, but the presence of many external links and the high ML score strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b838c12f517---13056121864.pdf In PDF document text
    • http://brenna-ski.pl/userfiles/file/ruxurulamox.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/pubagubakesugi.pdfIn PDF document text
    • http://jarosi.hu/files/file/30084131715.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612e92e1d5ce7---bixasumasimini.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/lomujujowilasapugibe.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210830_192349.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5oh6er2e0sgesr80tqeqjhqt22/gefodozakov.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849acd019c5---xagemitem.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beec4ef2c14---fipelur.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926752a5faa---negiluwigapunejiwerasa.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/96410875992.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/97925090ee4614430eb470d8407ff403/wizorijudulekulutepikepef.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba3dd6fd8---59611760242.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/53863773624.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/konapedov.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/41741888692.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jamokifuvipuninegitemonu.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/lugevofalopetuvumowo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/nigiroz.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/68437257511.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff967cc677---41797822633.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128e2a764dfa---75083088639.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/jalidulav.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/79395066900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=foxit+pdf+combine+pagesPDF 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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 18144 bytes
SHA-256: 7026f3637928e645f8726b76a445255135ac6dc7af5c6674d1af8c07adb58eaf
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 11036 bytes
SHA-256: 10d9c4d2c433cb38cd657b2fb139e81a91bd286a809d5245da55bd1aa0a135a0

Open this report in the interactive analyzer, or submit your own file for analysis.