Malicious PDF — malware analysis report

Static analysis result for SHA-256 a382177b4d729a6c…

MALICIOUS

PDF

74.0 KB Created: 2021-08-02 11:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddeaa386eaba17e0c6b92dcaa272072e SHA-1: f7fb163959d2e680ffe85ff5b90dc60b8b3a2bb7 SHA-256: a382177b4d729a6cf6bb001724e21a63dc421831b88c925f64f55b3d87dd2c7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are benign, are part of a larger infrastructure likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://maynenkhiinverter.com/media/ftp/file/94451290082.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/03e9bc84d4218b33a060bf281a562e86/7653420076.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607207fea5743---vuxedizuliwitopelamuberu.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/fovelowab.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/47320876256.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/59128654355.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/dadapino.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a6c1394dc17ecc9ecdff6101b3036655/vobudefem.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/6be09d884bc67e2b608f709ce5e7d132/62333562289.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/posisoroka.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/73141878565.pdfIn PDF document text
    • http://rld-carbon.ru/file/juxesufegadogavorevava.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f702df2df---zuwepafupobubepoma.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/98dda364040a2b9b5bbcc969f8d4e469/denobadejaludikajika.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/felebinez.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f166001d---bunaxotowolakovokefubave.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b863d412e79---jirevibapitikisotalak.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/13651567880.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609663d945ed6---lozijipavel.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/44110350427.pdfIn PDF document text
    • http://sport-jicin.cz/dokumenty/mizedexadamexazuz.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/kubinemex.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/89665046545.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/27160274531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=libro+suzuki+violin+1+en+espa%C3%B1ol+pdf+gratisPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f513d744208466c36eb8d0cae6f3d617/97440298469.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_off0000b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 11344 bytes
SHA-256: 83f4d36316db20e89e70338f55579d7503429c78c655ee703fee1decf5d237fb
font_01_sfnt_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 17624 bytes
SHA-256: 4589a8adac904a59217b30a6bd2b4ad01237507d178d3e5808bb2bca0c7a881f
font_02_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1