Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36133e2047bd44b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 06:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d38a3eb893cf6950e09fdd38b925a0f SHA-1: 7649a781137cec8b2f2865167f726206221817b7 SHA-256: e36133e2047bd44b4bdb178605e7e59af8a878e56aeb3e23226a5d87a26a7e7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of these link farms and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://coming-c.com/userfiles/file/falikowebupipudoforu.pdf In PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910033751.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jadomatubelob.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/43057832213.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2305a141---sokofetipoxabife.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/91711658246.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/bomatuwupekuvexuf.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/kanajakaputawewil.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/penabivefov.pdfIn PDF document text
    • http://normel.org/files/upload/file/18711558771.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/darafidugimakaduri.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/remezidelasus.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63d441589---fejaro.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9afe0401f8aabcc78dd52efc39759af1/riwezenilebis.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/73595982723.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40760982952.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/65827870591.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/70665525504.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d936211e328a4ae8b42fcde598bb0f9/bizipibilowotabogubega.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090412053886877.pdfIn PDF document text
    • http://gestioniarmatoriali.it/dugedevonu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/62136794037.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/040gfl9mcgh7q3n36f5ep0a8i2/60261967765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=madea+i+can+do+bad+all+by+myself+123moviesPDF 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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 11096 bytes
SHA-256: 7456bb9a64efd867898585b13ef6b449cff7e87708b713f963efb587c09aedc9
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 18232 bytes
SHA-256: f16fd186d81ee39320432f13d3d4acb7c0033c91ecac3a9b77f5c9c40138307e
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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