PDF malware analysis — malicious · 61e36e1aea56f166

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 14:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 67cb0aea5f7a12c61de6d2cbce7ab891 SHA-1: 2a6043211150b41a4d348ac776d55520e5fe228f SHA-256: 61e36e1aea56f16601dc54f66d45db9671a9588d05ed9cb0ea8e6bcb2363b229

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9764

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://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608889270fb5f---9512335418.pdf In PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b437dc784d4---15310144834.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae664c27cc---wavege.pdfIn PDF document text
- https://emmaushuis.org/pages/423987642.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c2a05ccffff0ed543ed141aeb29f8efb/rimisiwizavaw.pdfIn PDF document text
- http://megat.pl/uploaded/fck_files/file/rogos.pdfIn PDF document text
- http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xawutugukisetijo.pdfIn PDF document text
- https://termoformat.md/img/files/86647163069.pdfIn PDF document text
- https://zlatartopalovic.rs//files/toxifodosotivus.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071986eb1552---dunovaluwufu.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7c85ab57---pexutufanitoriremizare.pdfIn PDF document text
- http://pressvaluation.net/userfiles/file/busalezumukitirovirimixe.pdfIn PDF document text
- http://mea-travel.pl/userfiles/file/20088212778.pdfIn PDF document text
- http://www.aadhar-interior.com/userfiles/file/76044613454.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ej82cvhqhhi2ipr76innbfs767/59820042842.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87dfac629c---46338063449.pdfIn PDF document text
- http://charivne.info/images/file/wusudekubegelulotaxe.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b37459c48f78a1f5aa7976f2e9084c2/18912003076.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccc18a09f---tixiwow.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c6513225e48b6f42304a17ca5cd406fb/semuvagisexujobomisefu.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6325dab266---31131934036.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8210b33d6a6dab9cd7a2bf54bb2b80ba/rosivopunokimumakej.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d51ad16df9a---minifusowedef.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6ca55cdc---mepufikilem.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50e9c9b2---mevedarulirabo.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f7aeee21b61e55e4539a7b07d7ba4314/68910058057.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=insight+meaning+in+arabicPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00011d7a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x11D7A	24480 bytes
SHA-256: `2c8a170f66432d702a8a46d7ef7455ae98e4e455dc7e31f78cf46bdb087b6968`
`font_00_sfnt_off0000d50f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD50F	10600 bytes
SHA-256: `05e05ae2178494210265a129487fafe472b5194bbf000e6ab218619eea71e7a4`
`font_01_sfnt_off0000ed0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED0B	18776 bytes
SHA-256: `5d5afef3a322b283e4a716c79b90ca798e42b8ad4daa8e10a998aaf09492780a`
`font_03_sfnt_off0001483e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1483E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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