Malicious PDF — malware analysis report

Static analysis result for SHA-256 5374ff85adf29975…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 05:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec7eb70a9906ac9666ac3d21f9a4b2c3 SHA-1: 06ede0dee60687e82c4ddde8b712e597a4e69c44 SHA-256: 5374ff85adf299751f9a81971975af75e14c0fbfcc9b80aa0d7e774716dedc56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute malware. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=4d+parallax+wallpaper+pro+apk PDF link annotation
    • http://fxlcd.com/upload/file/99091647215.pdfIn PDF document text
    • http://keacg.com/upload/files/10199171957.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b7c0bca0---pelikodixonuwepo.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rarivowevovog.pdfIn PDF document text
    • http://erdbau-rauch.at/38822943026.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1g9pecdi354jit3arei95n27q4/bafomiwimebifol.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210910125747.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43931360272.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69f485dd8---85193783833.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xitex.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/92593906657.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-11/images/files/87565168328.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/kisufunemipunemigif.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/55673390644.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/tudagujefotewutekirofijeg.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sjak0egv5c98uf8fth8ne8nk00/xusivagunenoxaduf.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/70575208173.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee274da3cd---59542022794.pdfPDF link annotation
    • http://speckrepeg.by/UserFiles/files/83606635074.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/puwizotisetobijiverinopu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315e2a33bc9---56640317154.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/50444625930.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/69781408509.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109021241288165.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_off0000b65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65D 17892 bytes
SHA-256: 59dfd52f4f6065254e44ffbae4a59163fbe1d4a69e41ca790b33ab7ce228601f
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10184 bytes
SHA-256: 165b4041f445be88483567dac20cf574a138d5203f16dfbb633a65455dd2ef2d
font_02_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1