Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea9b21ffa8c5858…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 01:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74b258e82eb534b76b280e69596123cc SHA-1: 8ec977fa9b005e2f85b9083b311c10819ca0bcc5 SHA-256: aea9b21ffa8c5858a126b2e0073c278459b52d24c599414f7c6ab334103d5667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=funciones+del+nucleo+celular+pdf PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb450dff7---susupilatanonururulu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/dexepixojafonamojaxeza.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b04d396609a681dc7317045c4fac5dfb/xojebosu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac5d70233---xumekexujewananuvarivuxom.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/rapasox.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/46035469342.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bfp5q9abjmq227n0ttcjbre9j1/tiget.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/69664008183.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/58788238187.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/konifemidove.pdfIn PDF document text
    • https://nadamasristorante.it/file/gatiwujose.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e050452a---25099481313.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1e49d64df30e51189eba76b432fd9f30/21269542270.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/52da97bdc058d8ac61ad044ee3013196/99669219186.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/21976160822.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/13b31566000d90d1aaed399e5c1fb100/49831489273.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/25288230120.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gngn0i69fq08hsqtv4pqfn8sse/40632791542.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/90772559726.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/noliwetuba.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vupobekazigamotojutibup.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/34642540640.pdfIn PDF document text
    • http://industrialdevices.in/uploads/nuwilijevawafakamif.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 16552 bytes
SHA-256: 7beb41d3add4861e58a21d29f018e6cc732b302f8964d5c658c30f3f0f9a7971
font_02_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 10592 bytes
SHA-256: c74fb17fae5da3ad9bf06513c64488421516746f97b4887225860c449ec31395

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