PDF malware analysis — malicious · 6ab9604a50277be4

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 00:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f54424595dcab8819c8667cc55bea63c SHA-1: 18fff3e7572773c1169b5b23dd63d848268ed06d SHA-256: 6ab9604a50277be40d30345fcd1f4b9a24e28324185f71869b1abce67d06a027

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appear to be compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.5261

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 http://yearbookplus.com/uploads/ckfinder/files/72670705715.pdf In PDF document text
- https://mtestbd.com/assets/uploads/files/5070772339.pdfIn PDF document text
- https://brianhigbielaw.com/UserFiles/file/31376133054.pdfIn PDF document text
- https://mtestbd.com/assets/uploads/files/zigofaluxop.pdfIn PDF document text
- https://shastriratanchatterjee.com/ckfinder/userfiles/files/14493702644.pdfIn PDF document text
- http://transporteslaplata.com/imagenes_web/file/fowunufad.pdfIn PDF document text
- https://sukienmiennam.com/userupload/files/1466972940.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140420ea886d---nudezimuzowek.pdfIn PDF document text
- http://2478.ru/admin/ckfinder/userfiles/files/liwusuju.pdfIn PDF document text
- http://boschvietnam.vn/files/usersfiles/files/46415031464.pdfIn PDF document text
- http://artin-intranet.com/ckupload/files/sewutoveliwawawukijuk.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9vnpogn16h1vr3ta1pqdrncrpa/67233084605.pdfIn PDF document text
- http://jlm-kg.com/uploads/file/pobudabinesigatutined.pdfIn PDF document text
- https://omprintandpack.com/userfiles/file/pusegu.pdfIn PDF document text
- http://aranykoronakft.hu/userfiles/file/88374731099.pdfIn PDF document text
- https://jhservice.net/imagenes/galeria/files/40968934114.pdfIn PDF document text
- https://gadesign52.com/uploads/files/202109031215027514.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307411bb839---zawelebudozopelasorizo.pdfIn PDF document text
- https://sabunwangi.com/contents/files/lonenofafeluju.pdfIn PDF document text
- http://jiin-torng.com/uploadfiles/20210901173446.pdfIn PDF document text
- http://klpa.net/userData/board/file/26886009515.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jaromukufidegatunuz.pdfIn PDF document text
- https://cuatudongsaigon.net/uploads/files/97534655864.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+website+to+download+free+movies+without+signing+upPDF link annotation
- 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_off0000fb6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011386.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11386	11392 bytes
SHA-256: `bc1c455afc6bda5dde2e2e5e68c20a425d1586d661784fab4be0f40b372fc72c`
`font_02_sfnt_off00012ddc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DDC	17156 bytes
SHA-256: `cabd4471d15ebfa8cbea2fc23b6015b49eb190fdf6544a5e4a4e6a4eef5e31b0`

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