Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1d5cf7d7c3dccd…

MALICIOUS

PDF

96.8 KB Created: 2021-08-03 21:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b24fc5a30b8c17dc3f4daf6cd01bd932 SHA-1: 7fa44449a3b60700f3def821807762bb6eadbaec SHA-256: 5e1d5cf7d7c3dccd93eec90f193479b4f024f4ba22fdb45470ac906b8316711e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the 'link farm' heuristic suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e7da6a81991---bodubigefowaxapi.pdf In PDF document text
    • http://atenngo.com/admin/sites/site/documents/50278717842.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/46108711007.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210618230536.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/78137148586.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608332a986bc5---60191557060.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c309dd97f82---kofewuruxagefikovugaga.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b3a326a1c254b369598e684b63ae800e/8458305949.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2p9nu1s8k7jnl32pv1j62i7mc7/tadibajedopigiwatimenuj.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105c4996944d---36824151814.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c1f9cd29833d8cf82d186563470ba58a/59946039083.pdfIn PDF document text
    • https://susta.vn/userfiles/file/76500171640.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xibimeruwuxumevo.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/49792759247.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5c812kr484qrsnqa23fmsg3ks3/dulapesa.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/jasezigimiritemagi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3f18e731---pelaxorinimo.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/20163261466.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/9765506901.pdfIn PDF document text
    • http://fotossc.pl/_files/file/zadas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=all+korok+seed+locations+in+dueling+peaksPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 2048 bytes
SHA-256: 8735ea42ce8e2b8a34a5843a3e74da8a2d112b90e6989f3f634cbd25d83c2e43
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 18688 bytes
SHA-256: 6ff2e2a02622b34ba52e9602fa5305b6d98d14ab6d867af2fb5529f1ec1fa8df
font_02_sfnt_off000143c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDB 10864 bytes
SHA-256: 91cbd7c74fcf2e0291ec494cbaa32426843deaba1faa04b8fa546eac14bee158

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