PDF malware analysis — malicious · 17b54b3f18585828

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 22:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 5302dba3b02dc9b9a719c819b550aebf SHA-1: 4089612d3282dd2e75dc50b1898062cd972f3734 SHA-256: 17b54b3f1858582856e981d628063602cd74ddb28f4c998c46e062d4f04d4844

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, suggesting a phishing or redirection campaign. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to these compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://xosobacninh.vn/webroot/img/files/72425300836.pdf In PDF document text
- https://villatoscana-pi.it/userfiles/file/54096814171.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d99c9f51f---60024355762.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea611eab4a---xukujalivagujokeguziwu.pdfIn PDF document text
- https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/rarisepitan.pdfIn PDF document text
- https://orig-shop-gsm.ro/ckfinder/userfiles/files/48649118102.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dcsoillslovbigsrea9hoajfe2/tubizepuluwugujoloji.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/v1t71tvus132oc0l6k6mualthf/11947989975.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/7570955260.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e33d07722e79f257628f06b0f859134c/tujig.pdfIn PDF document text
- http://ainut.fi/userfiles/file/rojakod.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2476aa36---32299894366.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/107b9cb5b898d7d924573de738740f2b/zugufeketi.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161274ff7161b5---55843908309.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/buvigefolurabesinimok.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99011e57c---zapebexitip.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087989ce3871---10319003699.pdfIn PDF document text
- https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/dcdc322a3f9039b97f7e328430a1fcfa/58776459781.pdfIn PDF document text
- http://hyundaidongdo3s.com/images/files/90785122829.pdfIn PDF document text
- http://scan3dsaigon.com/upload/files/vibad.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42650482e2e57c94dc8ff9df85672f26/fawofudolinajurit.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aff37a26---14793307022.pdfIn PDF document text
- http://robwalker.net/fckupload/file/4386593810.pdfIn PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/2500b5d836b90bc9ae2bb8f0cf1dd939/5934644725.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+life+inspirational+stories+of+success+pdfPDF 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_off0000f4e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E9	10756 bytes
SHA-256: `959464a4603692c01e60c9a042ba0835104c006009199262d35edefd94f60b57`
`font_01_sfnt_off00010dc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000125d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125D4	19152 bytes
SHA-256: `c325babea7a15db7ba5976fdefd1f66e5dfb637aa294a8bebb897b6d8e4fc300`

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