MALICIOUS
156
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm hosted on compromised CMS uploads. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=a+simplified+guide+to+structured+cobol+programming+pdf', likely lead to phishing pages or further malware. The PDF structure and the nature of the URLs suggest an attempt to lure users to malicious content, consistent with a phishing or malware distribution campaign.
Machine Learning
- Nyx PDF Classifier malicious score 0.9961
Heuristics 6
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ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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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=a+simplified+guide+to+structured+cobol+programming+pdf PDF link annotation
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de35fd85f1---3295662801.pdfIn PDF document text
- http://slesnick.net/userfiles/files/risogakilipe.pdfIn PDF document text
- https://paymentor.nl/uploads/file/xebalixabiduse.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6d1f2f21ac187c4a5ed51400704dc480/27818246699.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pdoisj6idrgatpkdb4ctq31g6c/15451187751.pdfIn PDF document text
- https://alate.org/admin/fckeditor/editorfile/63703656095.pdfIn PDF document text
- https://iamtimeshare.com/userfiles/file/67354474308.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc269bdfdb3---68092046253.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e92cf33a---16146889722.pdfIn PDF document text
- https://www.hsbofmn.com/ckfinder/userfiles/files/nidoselej.pdfIn PDF document text
- http://albino-pitti.com/pub_img/file/pofasisuxew.pdfIn PDF document text
- http://carmakers.cz/userfiles/files/tafiwonekenugemolawe.pdfIn PDF document text
- http://graviroz.hu/ckfinder/userfiles/files/58119017898.pdfIn PDF document text
- http://tycoonmedical.com/userfiles/file/jenemuz.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b002a00e0d---zisufudevowejokumejeb.pdfIn PDF document text
- http://studioboscono.it/userfiles/files/kovubawizamowalusagu.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7a46c91a---madoxumofewosesadakunona.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/sm216pmqvts571s9dorv5dojg1/fedikiri.pdfIn PDF document text
- http://lotusburbank.com/uploads/files/54716948.pdfIn PDF document text
- http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/53838096256.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/79877162720.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751ea991976---77184773846.pdfIn PDF document text
- https://ladangmimpi.com/contents/files/2718184891.pdfIn PDF document text
- http://vin-baietii.ro/ckfinder/userfiles/files/3376867884.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_off00012407.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x12407 | 19388 bytes |
SHA-256: 8986c9b3c6e729869ebe90f4adcbc8f4a42b14e6a472d4c79af98f6f86c24a03 |
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font_01_sfnt_off00015607.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x15607 | 11184 bytes |
SHA-256: 4f6115e1b735b75b68d57a1dfb5efd7e46702fef1f7aa7856ee65a9d65494299 |
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font_02_sfnt_off00016fc0.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x16FC0 | 16792 bytes |
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
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