PDF malware analysis — malicious · 0d4c174893b6fef3

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 20:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 474d83a885a27cb6589e00326bf908f3 SHA-1: 5bc93a45028c1c7186dda9c0879aa63193eee05b SHA-256: 0d4c174893b6fef38bfa5eeed23fcdf3f51875c02d2c40ee998f0737783d11a3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://bk.knu.ac.kr/ckfinder/userfiles/files/wesizujonamavoratim.pdf In PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca2722891---70432352424.pdfIn PDF document text
- http://giustizianuova.it/userfiles/file/kejapekixam.pdfIn PDF document text
- http://puginternational.com/ckfinder/userfiles/files/wusub.pdfIn PDF document text
- https://nolimitscenter.be/peausitive/images/FCKeditor/file/zezeladebenegesuxivezoto.pdfIn PDF document text
- https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/308872137.pdfIn PDF document text
- http://cerritos.songhakbbq.com/uploads/files/22075420239.pdfIn PDF document text
- http://vivo-mebel.ru/upload/file/19695200597.pdfIn PDF document text
- https://glamweddingdesign.com/userfiles/file/gawagitepa.pdfIn PDF document text
- https://tatsolarlight.com/uploads/files/49667369235.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/52defdffdc6ed28ea1e275ecbf427392/3488721742.pdfIn PDF document text
- http://keralastatetailorsassociation.com/userfiles/file/37131489025.pdfIn PDF document text
- https://dehayemek.net/upload/ckfinder/files/mekaredafitukejilimati.pdfIn PDF document text
- https://syteq-pro.com/userfiles/file/jaruvexatunizigivijomupug.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1f911a92---rozekivodo.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dab035ae6e720562d7faad6e2efc119c/43352836685.pdfIn PDF document text
- http://texinpack.com/uploadfile/file///2021090604241040.pdfIn PDF document text
- http://yigang-lin.com/uploads/files/202109062043131124.pdfIn PDF document text
- http://cartonwrappingmachine.com/userfiles/file/84210517009.pdfIn PDF document text
- https://alshuka.ps/ckfinder/userfiles/files/55758365496.pdfIn PDF document text
- http://jatechkj.pl/upload/fck/file/wunivod.pdfIn PDF document text
- http://weifong.tw/fckimages/file/xewexojabujagepefo.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/66717675390.pdfIn PDF document text
- http://desushibar.com/userfiles/file/dojubotekedemikime.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161307b7b5a727---58290649818.pdfIn PDF document text
- http://thamdinhgiadaiquang.com/img/files/fijefubupulirujusezogo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ymusic+youtube+music+playerPDF 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_off0000dd4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD4A	17768 bytes
SHA-256: `3450f5a7db44a0dad0e759cfecb8aab18ed15bb2fcd02e83567602ddd6b29fb2`
`font_01_sfnt_off00010b85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B85	10768 bytes
SHA-256: `d0e072efe1b6ecf8396cf4f10996a7699359b0044af65a4f39046ec8fe03c05c`
`font_02_sfnt_off00012427.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12427	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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