PDF malware analysis — malicious · d83260ef87fc14e1

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 22:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 416b0020657425fd0a7fde3b0f50de14 SHA-1: 19cd80001b323df57088b070e4473e9f579ce87f SHA-256: d83260ef87fc14e136d930fd7482ba0a05ff5cc488a6eeccd9f4121f5d7c91c7

96 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 sites, indicating a link farm or SEO poisoning attack. The ML classifier strongly suggests malicious intent, and the structure of the PDF with multiple external links aligns with techniques used to distribute malware or redirect users to malicious sites. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust via embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 5

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608107df3fce8---31028700840.pdf In PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160920010660f2---43109831628.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe38a54fe1---77518080882.pdfIn PDF document text
- https://accu-split.com/userfiles/files/29058410559.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d05c13b96---66024376887.pdfIn PDF document text
- http://gramercy-grand.ru/files/file/turigabewovuvokemi.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9c0d836f38ea24e274567f3ab4181d02/wunogexoledid.pdfIn PDF document text
- http://eyupsifalibitkiler.com/resimler/files/vitifikikijiju.pdfIn PDF document text
- http://sierrahighalumni.com/clients/878712/File/16101397223.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a2828445---fenugutamo.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9817be6e941def90f1efa0d3ef3334a7/39998600815.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1f0addc537a3ec421f630a01effa146/robimuxufa.pdfIn PDF document text
- http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfff28005---domobezogevarizofug.pdfIn PDF document text
- http://immopolignano.lu/images/zivedonaj.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63c93b66b---86286954110.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f11270a181---72649674239.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dfc8c1314---banorebagugusurufolatemu.pdfIn PDF document text
- http://tablica-nieruchomosci.pl/uploades/fckeditorfile/9132044877.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bb297508d---giluwefiba.pdfIn PDF document text
- http://pantryscan.com/123cars/imagefck/file/lonudopinolelukuzitef.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8ceb968be6be47c2055886da47475a3f/dolarugepiporonir.pdfIn PDF document text
- http://bbfederico2.net/userfiles/file/gexarebijava.pdfIn PDF document text
- http://aucoindeshalles.com/menu/file/luligizegosi.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0cd009e71f395bbea3c807e225a65af1/pimurejawejuzikavu.pdfIn PDF document text
- https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0fe99e47f---5400042922.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=recovery+from+mastectomy+and+immediate+reconstructionPDF 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_off0000e91e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE91E	10916 bytes
SHA-256: `08ae427f2d06454abb50cf047fa7e57b23f2fedd5851841031fc6ba64f6797ca`
`font_01_sfnt_off00010278.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10278	16332 bytes
SHA-256: `e55af74cf98e85e1a8f667abbb484b7d389e7f753a7b8fd6c066ffdd151fa938`
`font_02_sfnt_off00012c9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C9B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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