Malicious PDF — malware analysis report

Static analysis result for SHA-256 f028d18940d89747…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 02:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af950a581476b8d279db50ab291d42fe SHA-1: 6abfe6f9a74bc5478b3f0a0a8430ed48978aafa7 SHA-256: f028d18940d897476596c5eeab5603639089345c72d763a4ee864b58eae474e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=how+to+report+levene%27s+test+apa PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc6d33913c---tepukitulili.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b165e94b47---13838938244.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/fomomakojotej.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zanutojutuxado.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/21794718560.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78657223477.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/sosirubulaze.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a03ed63dc2dacdbad39971eab163707/91523927464.pdfIn PDF document text
    • http://biosite.ru/images/news/file/33596631497.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3l70r5jhlefrh56g2q52lvtat7/60161706739.pdfIn PDF document text
    • http://championsview.net/userimages/18571566058.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ab94a5261f0fa4b1cd770de0fb7acdd8/87232836294.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/49461416514.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/82336241745.pdfIn PDF document text
    • http://sungder.com/upload/vomisigufupogabix.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/19608205898.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/munuje.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ff7a003a54740b4cf950b5ee54b945a6/71252658041.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080520500457.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/tenezugodaje.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/40ddea5c3829755a2b2ffca218bed6dd/14195216077.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fp4taf8ct97qqu8ohef8lrtmr2/vinorako.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f644fdfdac890694cb7c6534d1d173b/95068213580.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/84271616108.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10328 bytes
SHA-256: 25243b3c698b23f0d1a4d105817e381b61002a22741f32b756934512c4f70d9b
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 19132 bytes
SHA-256: ab0b77078651627a9460bb3cde7cbdf656b27689d0807ff2ade9642ffa4a5d99
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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