PDF malware analysis — malicious · d5f208cd84bd3c5e

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 18:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 2f553fa2120e27690dd848e9ca244908 SHA-1: 04f04a6fdb4df4a9f014d70e23f6cfae34d3a7a6 SHA-256: d5f208cd84bd3c5ecc2c4e6cdb4f65bea5aaca16b4fe87dd1e227e80f3ddf7f3

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or callback lure, aiming to trick users into visiting malicious sites or engaging with threat actors.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://chcial.ru/uplcv?utm_term=13+colonies+chart+answer+key PDF link annotation
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf2b7006b---31377731429.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hnvin5rhclf0rehd8ol28j5ig2/47071515962.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608928fbe7a5d---59778814232.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854334b4922---9973096529.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a337a6c47---webobotadugokixubupa.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/265a8f56bfccc3f6f66975f5e3520e92/46178572190.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qnfcgrfn724lbdqt2kc5ekmu28/21578019459.pdfIn PDF document text
- http://unicorn-furnitures.com/d/files/dakipetuwagizemezenetuzuk.pdfIn PDF document text
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/cb118463277c92319bd346d3b1a01201/bowiluluxotovomosivega.pdfIn PDF document text
- https://avela.md/userfiles/file/76175226540.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/jufaxoxugoduwuvik.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/87740480000.pdfIn PDF document text
- http://remproekt-m.ru/admin/ckfinder/userfiles/files/zovelugokevolob.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u4pbjvlf02jje92vklcdnci9r5/94619400229.pdfIn PDF document text
- http://trans-serwis.com/userfiles/file/dejojajarajuwunu.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7d1cb6adf872e7165a74152a4052bbae/48890793778.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f61c1c009df241717c2bab600b69fa21/bokidotuginit.pdfIn PDF document text
- https://pk-kuepfer.ch/ckfinder/userfiles/files/93061970034.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2249621a---88950254243.pdfIn PDF document text
- https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6522bf042adf1ea8111bae09c65a233e/3470057988.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be92df3ce---zizosewupuwukamu.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/793b59a21f5c65c6d3c74222c518f470/3085504321.pdfIn PDF document text
- http://korean-school.hu/hangul/userfiles/file/gasudemezak.pdfIn PDF document text
- http://americanpetrochemicals.com/customers/CMS-IMAGES/file/21892008422.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_off0000f23f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF23F	18020 bytes
SHA-256: `d94b7cba68518d20ea8a5ecfb0b297101aa56bae482fbf5ee5a83c0badb5e62b`
`font_01_sfnt_off00012147.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12147	10748 bytes
SHA-256: `433a4b686c6f180dbee36f4c2705c57fc52789c0d9fb37fe5dd24d25d458d986`
`font_02_sfnt_off00013a0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A0D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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