PDF malware analysis — malicious · f1a494731ca83746

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 17:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 0417fe4d09f8744401431fbba8980ade SHA-1: c2539a2cbe1c5357e1eadda6780de78c27617845 SHA-256: f1a494731ca837460de89eb4f90029dd1f5819297a5a9579f9aa5e41342b5fa6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely on disposable hosting, further supporting a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9902

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ad5b2532---3605271630.pdf In PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf6a37afbb7549f6aad94934370bc7ec/48772535897.pdfIn PDF document text
- https://aimhc.com/userfiles/file/rijisigaxodalisaja.pdfIn PDF document text
- http://www.kowel.com/ckfinder/userfiles/files/1626118061.pdfIn PDF document text
- https://landbondcorten.com/attachment/file/2241041f1aa62b31fc07b4291d955c4d.pdfIn PDF document text
- http://www.poliklinika-hb.cz/userfiles/file/moridesutepuwotoso.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a6fcef30b27e321fe3a003ed2be36630/nujarow.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/zubakemirised.pdfIn PDF document text
- http://kaithompson.com/userfiles/file/95273811739.pdfIn PDF document text
- http://quangcongluc.com/upload/files/volojiwalo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774103c6aeb---20387929697.pdfIn PDF document text
- http://pobierzplik.pl/uploads/files/6783690317.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vvv56gls3odm375lq0dft8l8bt/53150314206.pdfIn PDF document text
- http://indianspringhomes.net/userfiles/files/dojuxaxujajazer.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/dowutesifogarodarife.pdfIn PDF document text
- http://moonlightmontessori.com/upload/files/28971062293.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/36f94bf3cdfb92771b04dc45346c1501/27606943169.pdfIn PDF document text
- http://duepassidalcentro.it/userfiles/files/ramulon.pdfIn PDF document text
- http://wabasnb.com/files/fckeditor/file/1744723746610aa25d848d7.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a7d3b4e6b81f1fa8e552a79b662a0e5b/34257737663.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/90b06f6775d2e42432e5a0349bc4a56b/duwakuzugox.pdfIn PDF document text
- http://hnfhdc.com/UpLoadFile/2021072013444096603.pdfIn PDF document text
- https://agmatbaa.com/upload/files/jukuwebitixifi.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891d8fb3f2d---fakoxowulutapifanabosega.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uju2ra22e01e154o2lt7deua62/27363393888.pdfIn PDF document text
- http://accessibilite-salle-eau.com/ckfinder/userfiles/files/24392829016.pdfIn PDF document text
- http://kolesnikov.pro/ckfinder/userfiles/files/24783934220.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=atheism+in+ancient+greecePDF 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_off0000e871.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE871	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010088.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10088	10492 bytes
SHA-256: `cd449a4925d605ccc69b85ad81c03d80127a71a03ebd3e9644af0ad4ebf97384`
`font_02_sfnt_off00011836.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11836	17356 bytes
SHA-256: `cb3cbdbb2510a102dcbcb5874cc26f8865decbecb039e0d4b68282dd739abb4e`

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