Malicious PDF — malware analysis report

Static analysis result for SHA-256 0906ece3132876d4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 11:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 757ec9b9abc5e38c7b94a047a7bfbe98 SHA-1: 6a34bde0c8e90e104332ab4fb14ec2ff057be1e6 SHA-256: 0906ece3132876d45951d0d2afb5bd2b92e17e7ea98af423b27945a5ca38bab4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=neufert+furniture+standards+pdf PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/43e9fd3f2f6776b7f24d595b16410d6b/xepofulukat.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/niveriwowosofizonewene.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/65316977995.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092610ea4c67---86011663020.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a83a9d4d8---xomifufobi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082065802b61---vububoseraxofewoku.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/14667645693.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/dexusebufota.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/11813077011.pdfIn PDF document text
    • http://atek-ent.com/upload/file/detuzogazubewubusavawub.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082644ba2854---xuboxiguz.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/2553056799.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tcd7bts0fehcjtsv09rc6j90ph/pelujasexaloxusenaku.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9eb27ff9085061beea3490ec4e2f773f/zelifekikaluwudefid.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/mixomoladubufozosuxig.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a24e9e426---38576939742.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfc70bb46---nezowazirosikamutijobum.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kepebebadujopavavofimode.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/nokov.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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 10404 bytes
SHA-256: bf07ed8a5544805b8ace959885f9a4f97800f3c4554bbf9b52b222a967424357
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 18396 bytes
SHA-256: e6380ad0ea8d4dcec656b28b56d54eaa881e5fa7ded0e5532d25de1d2b741674
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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