Malicious PDF — malware analysis report

Static analysis result for SHA-256 16007c599ef044f7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 20:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32b27844c5048c903bf4989b9b5b5590 SHA-1: a41d93240eafa3f83f147af3327d6ad01d14cc66 SHA-256: 16007c599ef044f720b88151eb125ec15545e69c9fcf1b3cdedf6428f0424b5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are either compromised or use disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a second-stage payload. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bnovum.hu/downloads/38035960549.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b2fa1dbe1fe5f69629274f20b7b22925/zagimivuxo.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210821110844.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/fakesujujifimijikosanod.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/86141002563.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/kivibili.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/12112794766.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5fc6a776ddc74b427b2de417f7095acb/97823074402.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1d55809f---45067859540.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f78e9f5820997db3db46c13187e18efa/zanafazetozelukodub.pdfIn PDF document text
    • https://strechybenesov.cz/content/70743503217.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/am2b6r43dg4c4kcqnbd19btpu7/dubotamopabigotowimesejek.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/50042127236.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/24704357585.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/jagat.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4aa5e925---fadulogivorasavixokezojim.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1c5287b305150a3699337271e1830518/defigiwarilutogex.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/kevigob.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/62495009857.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zikakadujilosurojujip.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cb509d22---ximanerisolufanovixepafem.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996228b2f3---lokovidavokot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mdu+revaluation+form+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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10648 bytes
SHA-256: baf6712e57d4f71263e2e86b035a4b327b6eec69fe3e2b01039605a95236eb5a
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 18804 bytes
SHA-256: 6f124fdd5d2c143b0f424f9063d1f779f86420d32ba3b8be8bb688c15ede48c1

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