PDF malware analysis — malicious · 5023ebe6a874c781

MALICIOUS

PDF

76.6 KB Created: 2021-07-05 05:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 39585ad05b0d7e29dce083507b9ac891 SHA-1: eceac619efe23ebb6bd05821622f9e81450bc33f SHA-256: 5023ebe6a874c78171afa1b24d99a02d1b455e7b911716ea25fecf2b3cb88578

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised CMS uploads, suggesting it's part of a phishing campaign designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing attempt, likely using a spearphishing attachment vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4ff1d655---turuzuposogelisikute.pdf In PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c97de3eabc3---34516578658.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5ffbb141939e6eaeb876fd587cbcc640/39990123720.pdfIn PDF document text
- http://bahtiyardishekimi.com/fckfiles/file/66185912174.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/44802878076.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b2980390---resibotesipovibifekopexif.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/760da42679ce69d805fd16775cfa2a62/vakadifopagereboxaledube.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/fewonuragiz.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/794dea4fff28697890843d61a572453e/66602064127.pdfIn PDF document text
- https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/rupinitesasedalitu.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/031c36d46664fff839900678b9d306d9/84369041737.pdfIn PDF document text
- http://bertrandetgastineaudesigners.com/userfiles/file/makurodadakawokuzazakupod.pdfIn PDF document text
- http://amsasecretariat.fr/userfiles/file/58194173408.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/rr5pq8kpml4femnnjvh9lc3v31/gorixopugugadefa.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3516354146---33922164783.pdfIn PDF document text
- https://pinpointfeedtech.com/ckfinder/userfiles/files/kosexolasabemapogosomikev.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac9beef9c---mapobapodomus.pdfIn PDF document text
- http://boekenwinkelindex.nl/images/uploads/sivusozupaf.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/eec50b23b6690da40af3d5d1a1d80aa9/zajugavufavubok.pdfIn PDF document text
- https://anup.bo/images/files/womep.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2c636aa4---ripuvuzufovekosikisit.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/74348514436.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/69f2eusdtacu46f86acq1qv90o/mifagome.pdfIn PDF document text
- http://universalestetic.com/userfiles/file/jovorinowawoxip.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/81946922673.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=online+converter+from+ms+word+to+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_off0000c893.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC893	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e0a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0A5	16524 bytes
SHA-256: `adb5ad86f417281018d3feaee5902be0ec19e9cd1c91fcb49c621629b52aae9d`
`font_02_sfnt_off00010bd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BD0	10796 bytes
SHA-256: `9cfa4f68a6e0695343f8541570cc03e3bd45dd090654bdfde61234fe10247145`

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