PDF malware analysis — malicious · 61e89500c46ba59c

MALICIOUS

PDF

95.0 KB Created: 2021-08-13 22:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4cf56da802cb63d6d4be7047a9c8a970 SHA-1: ca281c07f6341036413e12798bd2937d88b0d51b SHA-256: 61e89500c46ba59cad6f147966e7c8e399154d5f3acab71dd727e798e489748e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common malicious PDF distribution method.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c139204c0c5---68749214323.pdf In PDF document text
- https://bauarch.bg/files/36896888159.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1abd005f0---96688852744.pdfIn PDF document text
- http://wintec-samu.hu/uploads/files/supixokejilerorubokaf.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8864cf456---87856248585.pdfIn PDF document text
- http://amsaneeraus.fi/userfiles/files/95333185147.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610935964fa30---todimifutora.pdfIn PDF document text
- http://kokocurry.gm/userfiles/file/fetek.pdfIn PDF document text
- https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vhchvapvlla42sesp9aef72in5/4634200882.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/lugukedibunujet.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/i70trf6lbg9ugpv25eatcpiir6/linedagakujutosadugudidu.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/7488994900.pdfIn PDF document text
- http://a-kamen.com/userfiles/file/45729539742.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ffb0cd88ad8be2967f5da7c4fe2b25ac/25832683499.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9d8f2225345b2d32cfa38c1d23cd4125/josizomesu.pdfIn PDF document text
- http://wksystems.net/HotelEstimator/userfiles/file/96113041482.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc0730cf---vitawulavigiwederepaponab.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c9687d14---53091753792.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/752ba09063bb7abd2be6c558be865f72/1349409878.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c436060bf---rebamepedobimeki.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81b285bf6---23513117105.pdfIn PDF document text
- http://metall-press.ru/files/52189531940.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/27be0ed44a0aa7c2ca3131387be1b65c/wutekil.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9c55eaff---3047825961.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db541a5091d---18668895470.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3d95c41d1747a555cd4915809e78019c/2713396786.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+you+track+a+text+mail+subscriberPDF 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_005_off000109cd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x109CD	18716 bytes
SHA-256: `fdec17ce4e752200b6fcc42cb6783891c550e6608a7a612314217b2e327e8005`
`font_00_sfnt_off0000f1bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012878.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12878	16752 bytes
SHA-256: `c642d01ba75e865ade4df48935fb8bece17ab46d56f0db9f7a6e17b31452385e`
`font_03_sfnt_off0001538a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1538A	10968 bytes
SHA-256: `1bddad2c73a3b2c7930e0ef94aeba627df02a295365f268cc2b057ff97fac37f`

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