PDF malware analysis — malicious · 09d9253b4f97e729

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 02:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d160d5a8b601e19d2ec1fc233a2c4611 SHA-1: 41e2b471850d8d6276378a5055a34fb020f99e24 SHA-256: 09d9253b4f97e7293062c6f1c2bb5dff4c98330f948e5c2504b487b25fba93ac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://1877painters.com/FCKeditor/file/jetajejidanopuziwo.pdf In PDF document text
- http://metallpress.ru/files/94135495916.pdfIn PDF document text
- https://lifetides.ca/cambridge/uploads/files/30354968023.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8cd059d5d---piwilisita.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fb14f23d---42786275638.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfed60d825---danorajatovajerejuwexo.pdfIn PDF document text
- https://airflow-skateboards.com/userfiles/files/23528765323.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a950ab35b25---wosuwovopit.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/28914118560.pdfIn PDF document text
- https://www.passion-rnd.com/upfile/files/2021/07/15/tajamoruzixa.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160789ed78261b---77156040478.pdfIn PDF document text
- https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/m9510d7lavc88fllfam72isf31/nebemonelutikapubewu.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e706f44176020c14f2895f8a14210351/pitawijenuwamafedinasuv.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/xipizovefagurofof.pdfIn PDF document text
- https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/4748825026.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a43b0049f---7165274834.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0nedkhclc6qjt7dugpeqdeq0t3/ladupunezad.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9c5f5a77d4688092b36918b25c3fde00/97567671284.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7f5aac1a---39482261802.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5a2f76599b86ad3231723211bdcd2c49/pevorarewedekoxafexu.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/sido0t04uns4f23ugltv9iuu31/19400011886.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f50992d397ec5337b0d32b083da027a3/3182055581.pdfIn PDF document text
- https://mytekas.com/UserFiles/file/91550846655.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d937981f0---89079595633.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=an+introduction+to+underwater+acoustics+principles+and+applications+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d9ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1BF	17860 bytes
SHA-256: `1eb20741d8fc29c93e1e1ab04eff2cedfa8096d0de6406a50f8da1c8e9e28e9b`
`font_02_sfnt_off00011ff9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FF9	10780 bytes
SHA-256: `9e8f1fa20ce2101f784ef3358abb75777321eb7fbda052f9c458bbf3d432cf27`

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