Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5b0fcc7a158693…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 02:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c57568e1464d2520d0110e3e299686a SHA-1: a1ece5e5770c3c91e153f5e7fe9070b5c1ce43d1 SHA-256: cc5b0fcc7a158693cbfebae9444a46602d9f558e020315256c85dcd7a28c7cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. While no scripts were directly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or phishing. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to potentially harmful sites.

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 http://lovesenergy.nl/file/44640917741.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/35137492518.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/jibives.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea781c6f8---xujaxipibuzokusigamomanex.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/rogixo.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/bebugeto.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/likiwojixevopasagekodu.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/34465624934.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/65319973511.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/28503134351.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/kebisupefazonopo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/50658090490.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/20423939559.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/xaxevijusomosevetata.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/movarofezeg.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131158b858fa---43060448952.pdfIn PDF document text
    • http://calisnt.com/uploads/files/toverezam.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/37793207932.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/28190772533.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pofudu.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/xiginaxukomuvamipezuk.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/50693593589.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fuzipovubarigomovosose.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nekaparonanajuzikofaxaka.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732fa0293d---96264452201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jesus+thank+you+for+the+cross+lyricsPDF 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_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 10732 bytes
SHA-256: 5ab5a099745bb508e1f136ca39959fe0fbe9820c226074085ffb5d6388002969
font_01_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 17624 bytes
SHA-256: 9d36c3b3d2fa84645b9ac4c266038eacea1188f6a4070c0813cc55a13ca61c9b
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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