PDF malware analysis — malicious · 04b5a23391c581dd

MALICIOUS

PDF

85.5 KB Created: 2021-07-26 21:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 41cfc94dbdbf9b553e60ec3dfe0d96e6 SHA-1: 51be6591d7ff0a25b7f337d78e70959c675cd04d SHA-256: 04b5a23391c581dd097b4a561c53148577f83fbda82e484bad210a2b1ddd067d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link distribution pattern are consistent with a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d20aeaef1bb---7615949921.pdf In PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436077b669---podusewitagojipariwip.pdfIn PDF document text
- http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1a67273c---gariz.pdfIn PDF document text
- http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/suziveva.pdfIn PDF document text
- http://ha-sine.com/d/files/tisirapazegibubizo.pdfIn PDF document text
- https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/181757e0ff6203f7f22692176d4afb43/jododekopino.pdfIn PDF document text
- https://marcuspietrek.de/MARCUS/files/file/10396433513.pdfIn PDF document text
- https://maisonforville.be/documents/file/lusafovaz.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7f47357055520fc2ac75704b256294ff/81798844235.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/be4ecd6c47492f62056fdbfe00611ed2/62987809441.pdfIn PDF document text
- https://birudongker.com/contents//files/90463392625.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79e2ba22e---94774550054.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0f7db288ffa03250616e58a5de7f2210/12402208763.pdfIn PDF document text
- https://soudurelauziere.com/upload/editor/file/81626372726.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/854ccd4e794252f5b543d30f2c6bbe65/22479253975.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dac27e38cc7---dadigamo.pdfIn PDF document text
- http://sun-eko.eu/files/file/wudekinef.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c57b1470f802de3d3a51faeded44bf82/29304129570.pdfIn PDF document text
- http://didopack.com/files/kapofutosabu.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/lowajile.pdfIn PDF document text
- http://f-okinawa.com/img/tmp/files/43851016007.pdfIn PDF document text
- http://dentalclinicbangalore.com/uploads/jibanibepinirijaxobolul.pdfIn PDF document text
- http://fouladsazanco.com/Upload/file/xoledukivedonozatufefudi.pdfIn PDF document text
- https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/jr3fqpnlg1kdqt2epoi2re9ekh/6461063939.pdfIn PDF document text
- http://elsekmont.eu/userfiles/file/jaximurax.pdfIn PDF document text
- https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8f544710b989bead290a8835dbc615a7/27175226119.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=problemas+de+suma+resta+multiplicacion+y+division+con+numeros+decimalesPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e7df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7DF	11096 bytes
SHA-256: `016d2dd3df1b68ee5af0c0daebf3d621ae65c023490fb4659f74d96cd2a4be7b`
`font_01_sfnt_off00010188.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10188	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001199a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1199A	17896 bytes
SHA-256: `2e55656c8af981b60c659613df7fd1fa53aa824521cc03f443462d52733cd8b6`

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