Malicious PDF — malware analysis report

Static analysis result for SHA-256 318b6ec1ad312ce0…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 11:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d339146b662e4384acd14c24534e9e2a SHA-1: 5d104999d541948694e0f9e0b54a1b1f31063421 SHA-256: 318b6ec1ad312ce0f41c1666929832093467bf503490d3a8fabc03c3fa926025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=will+god+forgive+me+for+my+sins PDF link annotation
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/99a71fd3c331e6d504d28829643b89f9/kafefanoninilejugilex.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/16186811987.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/50500611962.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f7f43b36ce2e0173ffd6c63fb8e3306d/kazoga.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b9637b434---dizoxedizokezinotisowev.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zutevudisem.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/45930921376.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/47465268450.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/xunejixegomededox.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29917f0479---gobimabofovunatu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aad9123aaa10747067ac1c108164fe7c/riwabamuxemadubidak.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/b7hvh5sbqm68mapd1l0vq0rtj7/46024137846.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/50402805165.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ro55vlt4u0lh86e01kism07sjv/pefesutopapu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/0d3b3dedfa0bc8b980e9a63c6c93dc11/84786357112.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6394e8984f---63961086945.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd226a3cf---13165469501.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/89f40e4a32f9a3e240c38367f99802b3/mukujifizofujejusisiz.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/riwasawe.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609434eeec814---66535052291.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c675117c7fa---ferijoputurax.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/femekubepamosixatoviwe.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1dc5e0b1d---37166804487.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_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16996 bytes
SHA-256: b0b720a5d5bb32ad15385bc7ddfb813f915d5212a903f31acf16430bf76254ab
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10612 bytes
SHA-256: d44f2f4bc982cf23211e97df4178ae1b6f75574fe894e45cda956cfb3fd1e7d4
font_02_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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