Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bc4fcb79cf8dd4…

MALICIOUS

PDF

95.4 KB Created: 2021-07-08 08:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5926d17764a36cbde64195b3aac16930 SHA-1: d7029f01a4a655a40ece7c348e698821a47b88b6 SHA-256: 63bc4fcb79cf8dd44051d0a19010688e5495424264ee0a68ede866a84ddd95df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm on compromised CMS uploads indicates a probable phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=how+to+hack+fragments+in+mobile+legends PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7049e8c6d6---teruvomakozajikupomu.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://studiotecnicodavico.eu/userfiles/files/nilujokavemalefage.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ch9eo1d9nujakjrr6jklcfa6fa/funorosuwi.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/wafelesudaka.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/30f4d31b32eb6dd22d885b284450645e/65121833260.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2f0a187c3bafbe3acdb5765ebb360123/wofakarizisibarukuvofagel.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/30178074849.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/44569781377.pdfIn PDF document text
    • https://stopserv.ru/files/file/notubemase.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/bd70412352de0ea53b5b070d44852b48/31155104964.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cjuvf9qhoob9d94k1itfn12g6a/13062562337.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97042d0dc0---1046989435.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf77818bc---31003019559.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/71459769684.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae57b4ff0---xedozib.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/vonik.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3276e64ebd---16764510843.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ba556d20---nizalagas.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086961667de8---4426923501.pdfIn PDF document text
    • https://etimes.mn/uploads/files/zujeku.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c01da7b38---ruwifab.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d0728c4df38---17063184280.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210529202031.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_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 22732 bytes
SHA-256: ad1cdd467c563151154462ae115087484ad4eaed451883314d75cce0ddacca15
font_02_sfnt_off00015447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15447 11232 bytes
SHA-256: 12a1d72d25aed700e328ae11594edf620e30dc8f36ca0b72e1347f75fd15d62e