Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e73e4e8f34a488a…

MALICIOUS

PDF

110.4 KB Created: 2021-07-18 12:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a05f5814d8d3e9236e8cc43b69d1d7dc SHA-1: 551deb6b38b4dea6334f0ba6bd3f26a212507ec3 SHA-256: 6e73e4e8f34a488a9206ac6018fa577fa026a203556b9be8efaf4ae633e5a3a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc33d8a467---38485667958.pdf In PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/4r4qmctagqpqc57v7ff2vksckm/dobudi.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/kiwuru.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgqbcq24ke5gmtnishr53luvdm/dowekakadotokas.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842371f011f---zuworugalegakomowob.pdfIn PDF document text
    • http://gewald.ru/content/Files/gujojekafobetukajovudopi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/pesiwotezujaxig.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d706544dc4f7ccb77f4535f63a15f20e/89580870916.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fuhs9bv6csud5qripso2hsiekh/4204209122.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b127ff6b107685ed6fcaf4d3ccc85f75/1913399671.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/lopebez.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a4819bce---diloxonativaxisisonefil.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/44959511642.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/21972861575.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/78766298669.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4af14a7d5c7a50c30e741649041a4258/68055899958.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/59629599017.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9f9433f0---vetifibaxagubefiju.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5j85ih53gshd3ut8s4an83ddq6/91462649774.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/zotedefonewiwabefazabub.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92d6c3f66---62417690533.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9678629a---darukolo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee0ad3976---zivivotabiwakup.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42cc84a9a---73363086746.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5e86fb05369b7fa367f1d0e1357f3501/peloxeritalixuduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=motivational+interviewing+counselingPDF 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_off00014e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E05 10648 bytes
SHA-256: 9f6697e3f4d201a02bbd901db1a24979d64851d91cdf3a0d41e72f77fbdc37c4
font_01_sfnt_off000166a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A1 17364 bytes
SHA-256: d40e3e6a7b3810183fda7a41cf4d04f8b8ed9080be1937ad60bc062d48a564a5
font_02_sfnt_off00019406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1