PDF malware analysis — malicious · 523da12991cfba4c

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 20:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 364c247888ac0e2e5f7be741295549f9 SHA-1: e66f9a2887184f6d57574adca7e2198c5aa605dc SHA-256: 523da12991cfba4c8d47c46a70a5fc7b03697d6d11ba2d6982c5b71a2f731bc2

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm or phishing campaign. Crucially, it includes a lure to copy and paste content into a command-line context, indicating an attempt to trick the user into executing arbitrary commands.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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 https://cructi.ru/uplcv?utm_term=how+to+change+colour+in+pdf PDF link annotation
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/krva9rht3302eo887nqe4ptc26/4277637901.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/31e2ca5eae5e805954d0fbe810f55776/zugoporipisizivijupo.pdfIn PDF document text
- http://worthingtonpark101.com/userimages/pinuzovigit.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835e1f22de9---wogumudelisatiwamiwe.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22767042f---97033004441.pdfIn PDF document text
- https://datajournonepal.org/files/witazuperunupuza.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0defef42d---dapejirexorewulavosojoz.pdfIn PDF document text
- http://onlineticketreview.com/images/file/pevaropagimopuwe.pdfIn PDF document text
- https://addsfly.com/userfiles/file/12041408750.pdfIn PDF document text
- http://xn--eyt274i.com/upload/files/kewijevojifiw.pdfIn PDF document text
- http://terezmisszio.eu/files/file/60108184760.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2abf4db38---godejavusajin.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/336afca1ce2c38c55c2b3a0ce5587117/tidojefuxod.pdfIn PDF document text
- http://dancedynamicsla.com/clients/38740/File/zumugifibufexutivobog.pdfIn PDF document text
- https://home-consult.lu/userfiles/files/musafefedafanuxadiluzu.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cronepv32rialhc8rtj078heb1/raruwirasotaza.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2ca781a3211a97c91d54471769e5a9b1/40262079613.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0b1ee5e6---rurutujupubatala.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef290f1be6---14426539481.pdfIn PDF document text
- http://scvumaichiramen.com/uploads/files/11652936727.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f61e54a18---15022855107.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l934ard6kalager0a7e8kvrquu/52788009082.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16098a205d6b76---tubibobowavutogeba.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sehqrnk02u9eot14ds04foqfsq/68411324578.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6546e12e4---verevaguzuwoseraj.pdfIn PDF document text
- http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/sowowegex.pdfIn PDF document text
- http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/posit.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4ca32c77ceb27e11e40be3e19f35b77b/66020558488.pdfIn PDF document text
- 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_off0000f234.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF234	10908 bytes
SHA-256: `baf354cbfd59da9bb5eb4ded2e5ff8e2915262206462ec20651f30e2f57ace6e`
`font_01_sfnt_off00010b32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012344.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12344	17140 bytes
SHA-256: `d44d04bcecb71747e7c51109d166b9d3763e96a254224f1d497dd5e45432c521`

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