Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eafa0f285609a75…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 16:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acf415c85389ea6b6117d363ca07b971 SHA-1: 2a2a812f2ebba3e32e5a14eec00bdb5a65eaf729 SHA-256: 3eafa0f285609a75c946f1ed8a0292b00bfadebb94dac203579f2bcdb01a4b24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=urbanismo+geografia+pdf PDF link annotation
    • http://fli.edu.mn/ckfinder/userfiles/files/75904286557.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e08a1e05---legukuzalu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5c0e8aaa---rexidotatezo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/69922923282.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vosaxijexubesinuxijiber.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078893827ecf---28290613912.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2509a68035c4846c379b81948498e199/fuletalefoxa.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/49100915432.pdfIn PDF document text
    • https://europartner2.pl/uploads/38753353424.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/79a97a4eb1c297170ce3eece2050991e/dovikurevogotubimudoware.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8366f3c8063dd818e2e6a993e3cfadb2/91972602599.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/19963719663.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e63da6c2---80086232572.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eda260458---tometiwapimemonegoj.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/33546262559.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/cgoammtfdnq7u66267upu17h3e/bupovef.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4351908773.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36de4d6be---remokewexifurokisatig.pdfIn PDF document text
    • http://hanleyresources.com/images/70084617798.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/43614370535.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kesimazujeninota.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wanisevawadulitoxilifol.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_off0000b6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AD 10844 bytes
SHA-256: ea95b6ccee0a6f35041510b8ce9fa34669d84c6cea02bb171d5de5d3d424adff
font_01_sfnt_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 16064 bytes
SHA-256: 9b75ba04ce799a23cc1f6135018105f2ab326148a929d4c0965cfa509d519df8
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1