PDF malware analysis — malicious · d6eb6c333482eb36

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 14:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9e28be5e0c0b1e9f08bc8b70c2c16ea5 SHA-1: 4d96282b44d495c9856739b4f46f16eb6f5da6da SHA-256: d6eb6c333482eb366b22ffacc21d1b89bcfdea99a23e8a1af5502433a7a90df0

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.5544

Heuristics 5

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
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://nomylo.ru/uplcv?utm_term=download+novel+kkenzobt PDF link annotation
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142e88a7dd38---57491079306.pdfIn PDF document text
- http://malovanesklomh.cz/images/file/38690657411.pdfIn PDF document text
- http://iseveranscopy.com/upload/editor/file/5150716503.pdfIn PDF document text
- http://www.parinet.fi/tiedostot/files/putavo.pdfIn PDF document text
- http://haki.vn/uploads/files/visotalopopatojupe.pdfIn PDF document text
- https://holyfamilyhospitals.com/ckfinder/userfiles/files/66364831175.pdfIn PDF document text
- https://takipcisec.com/calisma2/files/uploads/kixekebokog.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/56287922484.pdfIn PDF document text
- https://akproauto.net/nbloom/fckuploads/file/jezerixojijezazubigi.pdfIn PDF document text
- https://typeone.com.my/ckfinder/userfiles/files/2961558878.pdfIn PDF document text
- http://alfadent-volg.ru/images_uploads/files/87361674252.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/g2n2mqbdfelpffkhroob90lkq5/91196492506.pdfIn PDF document text
- https://invision.buzyhub.com/files/62300392458.pdfIn PDF document text
- https://millvalley.com/wysiwygfiles/file/tijumebasododejili.pdfIn PDF document text
- https://aarhuskortet.dk/images/file/20017529045.pdfIn PDF document text
- http://kwiatmetal.pl/userfiles/file/nedibivipulo.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a805c198f7e12d3dee90281b9dfd0e1a/ziduralolup.pdfIn PDF document text
- https://szelvedojavitasmiskolc.hu/files/files/51948920589.pdfIn PDF document text
- http://ciskmv.com/css/file/71010288346.pdfIn PDF document text
- https://www.jakketoes.be/ckfinder/userfiles/files/tawagekipolazenuri.pdfIn PDF document text
- http://wixoon.hu/upload/file/wemofawaruzanajilav.pdfIn PDF document text
- http://jyjwqj.com/uploadfile/file///2021091007431814.pdfIn PDF document text
- https://cinemaparadiso.site/uploads/files/1976433180.pdfIn 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_off0000d59a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD59A	20308 bytes
SHA-256: `b0e38808289a52bfb30b1cfc6a2bfc79265e8873852d3197122420b0d8fd3255`
`font_01_sfnt_off00010aec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012303.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12303	10324 bytes
SHA-256: `7e8a81d1b96de6ac5a73531cf2c374c328c16d71cba6474e12dec465bb9ac929`

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