Malicious PDF — malware analysis report

Static analysis result for SHA-256 1252131b75463a4a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 06:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13b9b3861d0226eba69f98ae468d67bf SHA-1: eba765d593974b537ab67c1484d5cf60536d1197 SHA-256: 1252131b75463a4a4dd3cb24c44a1f384b92f1bf6b8f86ca6172656b2d1fcd59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881856f53---gexixukowiremupe.pdf In PDF document text
    • http://nandeestationery.com/userfiles/files/51894803997.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f18bb43c0---10440687525.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/mugojaliloko.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ecac084c3eaad536c96977fa9556686f/sudojenipamamuminirix.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b0178f7a---jototunobo.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/jaxajejekanuxexok.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/43469850781.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/suwisibepek.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/erfbkgbsev83dkvrgn6upv4mms/85264375321.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/229c1deeae98d0a91c618734f3e6f118/jopuzixaleri.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/62376199604.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vujhk9bsonggbkhiio7oajlbs1/migelijet.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/82836132109.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/buqa0sjcn04udnepllqqmt4vn3/86587455761.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d6e62b5b15863b32b6f9e09536cd2598/31672420462.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vixovekonedofefopaze.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/fefakazumovopapavifalaju.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9cd5fca8097a6a99da80f5eec9c54ca5/rivenorufajenav.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/845ae79cbcbc888b1c047c857955b392/99364941593.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210625190644.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc804829be0---92077887566.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/jitiwijarutobarexebogazad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sodium+hydroxide+andPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 10592 bytes
SHA-256: dcf997809e7889ad9a2f710d08218dcec9e6ba913ecb1b981479d7132e45a2fc
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 17972 bytes
SHA-256: 7545f9193358c350a7479916f97d47cd9e9d0d1bb9081b89eca715108976b6b7
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1