MALICIOUS
96
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious with high confidence. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for these links. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious or SEO-manipulated content.
Machine Learning
- Nyx PDF Classifier malicious score 0.9948
Heuristics 5
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PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARMPDF 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.
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Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARMSmall 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.
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External URI info PDF_URIPDF contains an external URL action
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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://krisoc.ru/uplcv?utm_term=microsoft+power+bi+learning+pdf PDF link annotation
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/54558e1a935d1266426eca6b90c8586f/53782031591.pdfIn PDF document text
- https://sportsht.com/userfiles/file/42130338877.pdfIn PDF document text
- http://wittlich-luexem.de/userfiles/file/3494442164.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ba9d94fa---20085709535.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/jawosavonifevutimonugu.pdfIn PDF document text
- http://robotsuk.com/luckingbros.co.uk/userfiles/files/31717087710.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dgu7etksintkav1ijs24f6mi87/72013227549.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g9rb728r89tn1ph79jbfghp1u2/kunifona.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c0b3f892f0f2afe8366f681c2e2deea9/dupagavitawimoluxon.pdfIn PDF document text
- https://okud-istra.hr/userfiles/file/diwibuxolazabegoz.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b4bc04b8ac7a852e263ab932d137a7a9/gunaxasawuku.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863cda550bf---60529031055.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/61a140c5935a88bce3625dc123fb41af/1602554124.pdfIn PDF document text
- https://btsis.com/upload/ckfinder/files/2071707909.pdfIn PDF document text
- http://apexibd.com/uploads/fck_uploads/file/67344774812.pdfIn PDF document text
- http://gfhs1978reunion.com/clients/56625/File/66064366130.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1acd8e0e7---lekafa.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2190d1928a---97853013379.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba349bc432b---77511448335.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00959951eb---85162582575.pdfIn PDF document text
- http://www.odnpoznan.pl/fotki/file/file/40497578733.pdfIn PDF document text
- http://bluekeydigital.com/images/pic/file/vifezamosuvutabilolabajo.pdfIn PDF document text
- http://natproperty.com/userfiles/files/vikawixapabipelowiratuwa.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.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_off0000c593.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xC593 | 16824 bytes |
SHA-256: 05b3f23dd3eeafa44e547e16fdae981d79252315dd20aea8b2fdb6e94d7fcc4c |
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font_01_sfnt_off0000f0c8.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF0C8 | 16792 bytes |
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
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font_02_sfnt_off000108df.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x108DF | 12904 bytes |
SHA-256: 47ce741915b22b59bc938f98215fbef86c3e17d623618cbf2f486829c768f39e |
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