Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f822d1e30fef35…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 05:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69f6b5042d2c4f90c68ec4b3972dfd9a SHA-1: d764fd5e830cf0959e6927d6cb26897122070127 SHA-256: 55f822d1e30fef35551e7053b4c819886b2164eec5f1585ce2a591eab14dbdcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=esp8266+programming+guide+pdf PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf397c325b7---23995491548.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/rajolarikevexalixa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-4/20210704220914128497.pdfIn PDF document text
    • http://ahchala.com/img/file/24638554442.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902aa6d48e8---wezexafagotiriguduf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8da52866---4328253974.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85060969ad---28987990307.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/98503750639.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cffd13b68204c72b70061aa857f8682b/66850444595.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1db80a6168e627a21b7a9d420e0dd8d8/12046848653.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b371cd25---45124715045.pdfIn PDF document text
    • http://goref.ru/files/file/tomuvenodojefekogelosi.pdfIn PDF document text
    • https://quaint-house.com/58876241761.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qq78lqpq7lugcnbjmruu13ltvd/pitibagimisuku.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/dufuwo.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeduxexa.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zazagalagimiwizibimudo.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/76300693712.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/48319406915.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715c94efca5---novopo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073911d168f1---xebakovirisavinijewu.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kejopalomovip.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/94863988535.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077636b95440---41616876168.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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 11276 bytes
SHA-256: 7a4d829325f9319e41f6fdc1fae425bc34493563f5e0585359d6d65be752996a
font_01_sfnt_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 14368 bytes
SHA-256: 89e7af3e8afde63f19428f9cac8d3089e44eb985d53f7a00b7b6f253a3dfdfb8

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