Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b4aaae431cee09…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 19:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb4abda131d5f9d201d67bbbc63274aa SHA-1: e15d633305d04e398088e74b186568cdb56f9cac SHA-256: 70b4aaae431cee093010c6870766d193ea237d7e554fb10395e0ea7c362e3020
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to multiple URLs hosted on potentially compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142f6d71a248---27090722118.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/jikasokopukabafojamerezev.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nujekijilenusupikopevuwe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tefijolikekalomam.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/12933017045.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/bujuzosodokutu.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45816814499.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/vexavejudunokinumebe.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/59359471730.pdfIn PDF document text
    • http://terrietanaka.com/library/files/duses.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f181e12fbe---99721350084.pdfIn PDF document text
    • http://wixoon.hu/upload/file/2597116367.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/42016754324.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/muwafadofaxopegugubid.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/44173645285.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/rizurironejawekiwasije.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613240536d869---linalolus.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/3220674554.pdfIn PDF document text
    • https://equinox-e.com/upload/files/45923526242.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/65513895471.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/94354621537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+m+coins+in+minecraftPDF 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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 16748 bytes
SHA-256: c61197c7c17c215ac731f89ef5958557e0203178d309ba6bc4cedaad5b592e71
font_02_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 10712 bytes
SHA-256: 25824cedca447e4fc33d06f2989d0200b6f167d016c1d89993348b8b8d9b4191

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