PDF malware analysis — malicious · 18adadcb333f6b37

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 14:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: f9a1cf34fecec50a8b1f6bd4ed1f2414 SHA-1: 5ac3ec8a50cc2512eec7de9f17bb67b2e91abeb7 SHA-256: 18adadcb333f6b3739b4293a406f75e654811d4b8a8c5aa5f91c7ff979ad0c8e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to potentially malicious or phishing websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a968768054f---42844157971.pdf In PDF document text
- http://twfindia.in/userfiles/files/80778742115.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1c01fcd5---jaduse.pdfIn PDF document text
- https://thefertilizergranulator.com/d/files/morapararabexilelumeben.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a97347e73cea4ad1ecf0514cc89511d1/vitugokubif.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04d03a561---resuvu.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/16u8t3o07cl3ovaiiu0gj083c7/lumapaliduxa.pdfIn PDF document text
- http://kwartetproforma.com/userfiles/file/59611415477.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/1643a25be41f63fbf30ed6df96a6fc0b/25808987848.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/79ec5d6506f3a56416d0c6ae437a08e9/pixiwir.pdfIn PDF document text
- https://ocbond.org/userfiles/files/55852934777.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0b02bbe82d1f94d2f81f774ddab2998b/1232971141.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7edae3cb---vijerubanonewatamukom.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a81940113---53249990190.pdfIn PDF document text
- http://longarmacademy.net/fckeditor/userfiles/file/60741725874.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k82carvag6dl7vbcllach2oppn/93462447594.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d9db6941dc17df68435714b8764161f1/83104815008.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ce67381c---gibawejexojobadosumolado.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jmin74od8pl87m3fa9s4ckubjj/3308507146.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/678671966eb2a1a17b3b1c056d8d7206/76286328823.pdfIn PDF document text
- http://ourgans.org/userfiles/files/tuzejibonekutixefaza.pdfIn PDF document text
- http://www.puhito.hu/uploads/sinonapozigi.pdfIn PDF document text
- http://agendatourvietnam.com/hinhanh/file/fatojatezarutikofazelu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fresh+prince+it%27s+not+unusualPDF 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_off0000f595.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF595	18216 bytes
SHA-256: `d90d4141240df884ec56588680b949608172e233b873199f07bf0257e7b79460`
`font_01_sfnt_off0001254f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1254F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D66	10580 bytes
SHA-256: `fc95d5df3128372ad214d2377964df12751afd21e634da07fc4c07ce51b03c7c`

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