PDF malware analysis — malicious · 21dd2b6e638bf9f3

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 10:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e9534c2cfabf21f4a1905b7b325fcfff SHA-1: b1251973aa7a161153f4cd0f667790947ab2ab55 SHA-256: 21dd2b6e638bf9f37cf47b87faa382f71c8a065c8ed823a3df30577cc7186f6e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic to obscure the ultimate destination and evade basic detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=univen+postgraduate+prospectus+2019+pdf PDF link annotation
- https://vyrukrc.lt/userfiles/file/bojenivifotuxu.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/45o3la8ssq6etobapptai4vh03/43270004568.pdfIn PDF document text
- http://flygarfield.net/userfiles/file/43271324093.pdfIn PDF document text
- https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ea4b983c---kuduxakud.pdfIn PDF document text
- https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/najedabuwaxezigurifipede.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b026fcf68b---27556579638.pdfIn PDF document text
- http://tuanayapim.com/rsm/files/vekexarul.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efaaecdbdc4f4de73d25a5890006805c/gutowokanod.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8acbc27468---bowozuguxesozetutul.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d83c7105ac9---20611438790.pdfIn PDF document text
- http://fobosgrunt.ru/files/ckfinder/files/49186819275.pdfIn PDF document text
- https://igescanada.com/ckfinder/userfiles/files/wakibogekoviw.pdfIn PDF document text
- http://pathtojanna.com/userfiles/files/8013049027.pdfIn PDF document text
- http://pechati-piter.ru/userfiles/file/99293080322.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b2088b7a---58707090261.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a94032685---27244120482.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba25760baf9---25166686480.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/pofixogefakivibagar.pdfIn PDF document text
- http://juentai.com/userfiles/files/sisidukegedalabe.pdfIn PDF document text
- http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segapabizunus.pdfIn PDF document text
- https://dgaspcsm.ro/ckfinder/userfiles/files/23733154085.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca4d4f1f2---tibupovexatezarudom.pdfIn PDF document text
- https://lapalettedesarts.fr/gestion/file/tebetolin.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfb41448d---62798844731.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d940e8cc5---61126120248.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9929d2f1fd016bcf7f67a0b4723c4ccc/17225746875.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_off0000d87c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD87C	17340 bytes
SHA-256: `062e422e5e97435f4e06e80782877ac9eb47cca1789b07831fedc0337ddd8600`
`font_01_sfnt_off00010540.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10540	11384 bytes
SHA-256: `26ef32c4143e353e10fdaf020945d10e826d99356a10ccd5642fff591c48b89a`
`font_02_sfnt_off00012029.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12029	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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