PDF malware analysis — malicious · 51665898193582e3

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 07:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 64b10ec219e26872d205ef964b0728c3 SHA-1: 69313be783acbcddf587340acef819717503dea8 SHA-256: 51665898193582e3d49c19149e75cc6090fa16a0b715f35e1f5b9229717bd3b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=how+to+clear+local+cache+on+android PDF link annotation
- https://thaiahpa.com/flash/files/72642000990.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161395100870ab---56546259353.pdfIn PDF document text
- https://kiptep.ru/file/3378481542.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/76365596498.pdfIn PDF document text
- https://medbillings.us/lightspeedweb1/file/9825755909.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff78103f3---mufeviguzi.pdfIn PDF document text
- http://aal.tw/uploads/htmlupload/files/55203845103.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613174cb5fb09---38534543413.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/werovopezusevobero.pdfIn PDF document text
- https://valve-toho.com/userfiles/file/15572513293.pdfIn PDF document text
- https://www.aicsmindia.org/ckfinder/userfiles/files/10753755900.pdfIn PDF document text
- https://vibingvibes.com/userfiles/files/nomadomiw.pdfIn PDF document text
- http://dlugopis.kbo.pl/ckfinder/userfiles/files/domike.pdfIn PDF document text
- https://sonntag-immobilien.lu/userfiles/files/rewokejuxaresowolegukuxoz.pdfIn PDF document text
- http://satcomlink.com/userData/board/file/64497542444.pdfIn PDF document text
- https://harshahometutors.com/uniformkontakt/userfiles/image/files/zebotaratixumumem.pdfIn PDF document text
- http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zonubotabilarejanuz.pdfIn PDF document text
- https://www.alugutader.fr/ckfinder/userfiles/files/sopifepe.pdfIn PDF document text
- http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/14038328680.pdfIn PDF document text
- http://theloanwala.com/userfiles/file/ribapoxato.pdfIn PDF document text
- http://askort.pl/Upload/file/50441059988.pdfIn PDF document text
- https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/42064554107.pdfIn PDF document text
- https://matagujrischool.com/admin/imagetemp1/file/jopezezovofilosexe.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_off0000db52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f364.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF364	18044 bytes
SHA-256: `0e2e7d211cf8290a5c35a5f78c51d777a18665f26cf93eed7b28b1590962965a`
`font_02_sfnt_off000121c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121C2	10376 bytes
SHA-256: `e29a98a5bdc9f90c3ed005bb58a6b4ca8a73ad903bbe7031e68ef42e56ef6875`

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