Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ef327500d05031…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 01:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f6c2555eb31a3f28b12b65a50cabc01 SHA-1: 5fd460e811710396ef0884b32a1d3fb62bf04a39 SHA-256: c3ef327500d05031cc106427f296622d327df0cc6dbd4a02b4611ba212a9976a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rumahbaruku.com/contents//files/lugoxofeboparulisatopip.pdf In PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/36426741757.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/jipuwikimoroj.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a9a41f059f3e0e2c274fdbe952003/14579775617.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/53343370391.pdfIn PDF document text
    • http://web68s.com/upload/files/toloduposilidobolapep.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/37014118530.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zejarevagowija.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16119d0d710096---46334460425.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1c827826---67349447636.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff9cbb7ee---100828568.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611d371e30d0e---48549805021.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/33943020276.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/98459874392.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/97cab541d33106722153578a2110cdb2/tukixus.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b73b46f5ff---63987634815.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/891c8f275d47c2bc05adeed52a64f5f0/12564732115.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/fizenatatosugute.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623069909.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf806e8c795---50644680039.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843248e8f08---29353416843.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/ledumepelavisiraka.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_FD29B068B32F9F0C.pdfIn PDF document text
    • http://bulmarconsult.com/files/29048625803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lettering+practice+sheet+pdfPDF 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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10692 bytes
SHA-256: 3093ba72eccbc03e78668946670930a0cf49d7a2f7e1679f65c7661bff3f8249
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 17672 bytes
SHA-256: 9bf9a2b502995a6a3cd9faac7d5ce6380a165ef21dccc8e3bcc836b5837cf8ca
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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