Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16f884a32f903fa…

MALICIOUS

PDF

92.8 KB Created: 2021-07-26 02:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d03a4110d335b41df9e49d2761bb9e1 SHA-1: 33a3cf91f1a34998e6831b8886a4d6632bd1308e SHA-256: d16f884a32f903fa745e31d4772d5d33bb50bbaaed6b4fe1fcf82b8ec231900d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic findings and URL analysis point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://skiflogistics.ru/userfiles/file/68411775909.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf889c7920---30454047731.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/774f6ca06e483a7d85c4abec9a5812cc/82865895028.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd24d871b---girewuxisaruk.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4086a5a32c5736909c5c3a163f8581c4/93652065069.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/73395597860.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/545235fe6bb59d2e422ac52240691259/55231129432.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/79230508999.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dbd2fea09058a42f3f21601d63c0451e/2508355198.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c0445208faeabb4b5f4070ce98490cb5/59338429167.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/47888738638.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/19558615084.pdfIn PDF document text
    • http://iltorg.ru/upload/file/79951610410.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a424138028---76087175832.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd72e13e3---wuzelazuduleduzefubofuju.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2a4e8c1b---62034580594.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nabutakep.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/bowipulizudajimexivu.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/8805093836.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/26138261068.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tqmr663tkr5ets9ctgb5jmrs7t/43613764582.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a65365f7---99856686136.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/11839909995.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=exemple+de+diaporama+pour+oral+du+brevetPDF 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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10672 bytes
SHA-256: 42c599d9a072ff178d8154ea2e6c4fc290cec1cb83dcb9433c1752875c3713fe
font_02_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 20176 bytes
SHA-256: 54d93118ecf3adeecfd43c80adbd6d78fe833c229206c75af20255ba5643d2b6

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