PDF malware analysis — malicious · 36451e8cdaa52398

MALICIOUS

PDF

87.1 KB Created: 2021-08-31 18:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: c27130c673834ef7eee07b83a4084fce SHA-1: 1a97f82dafa3c75699e882721aa4b27d92031da3 SHA-256: 36451e8cdaa52398505dce86547b1c5f9fc1b1d40b1d0e1eca2ddcf1bacd3da5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=movex+user+manual PDF link annotation
- http://badgerhillfarm.uk/dimibobano.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93040b9d32---5196023785.pdfIn PDF document text
- http://gruppocaminiti.it/userfiles/files/jabop.pdfIn PDF document text
- http://royalrep.com/userfiles/files/titunafijasunakidomi.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/userfiles/file/migoma.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a852938f356---6667972360.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/acdd4d7f7bd44584cf42fdba5635eb36/xezurasetut.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/09a3aae3f15afc1a534a30f06948ee57/26393724530.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/73406d2d2bb0c5d816e805581d53bf27/faribivof.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d22dd218393db128ae667a3e03e86cad/75783618608.pdfIn PDF document text
- http://brandweeramsterdamamstellanden.nl/userfiles/file/99922715153.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f5113f1716816d70ad72998e7f8290c/siripixinegetovetigadofux.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e616356e22---buwota.pdfIn PDF document text
- http://commsoft.nu/demo/ktb/wsmbilder/files/61529841820.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b4f8e4a0---1242852462.pdfIn PDF document text
- http://russia-ex.com/8878489969.pdfIn PDF document text
- https://emotionalgift.com/ckfinder/userfiles/files/70827508932.pdfIn PDF document text
- https://12shio3.com/contents/files/39010956565.pdfIn PDF document text
- http://mcap.cz/images/uploadedimages/file/25841040956.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd6807fd4---pakuz.pdfIn PDF document text
- http://ydyb.com/filespath/files/20210827210707.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc9d4d415---wexiw.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_off0000eee9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE9	18260 bytes
SHA-256: `30e1f876e1c7ece9de76e5009167dc50718cce1c2f92dc354e8407ef4f28eefc`
`font_01_sfnt_off00011e8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000136a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136A3	10340 bytes
SHA-256: `ac0c8639d88bf67f8dfac9cc085e45a8e8039e7455d4f71ccc5f625631b20d62`

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