PDF malware analysis — malicious · 5c95af381e6a96de

MALICIOUS

PDF

88.7 KB Created: 2021-07-28 01:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 9c56244323867d8a801e495999c24cff SHA-1: 19c9be595bd4d0c664edb9e7d24c77fcc2355b54 SHA-256: 5c95af381e6a96deca1627de35c29b1f9987c90f0e96d18ff5c88e7f79015899

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple unknown URLs associated with formcraft plugin uploads further supports this.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aa8c5035---60835700792.pdf In PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c948a56ddf4---72134728447.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/07a4f7f85c268e0cf9f0092482937543/nopebexexuwo.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfc34dbb8---xajoruzinezirawojomulutu.pdfIn PDF document text
- http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pekikepat.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a782967e9b7---tubumemupinaw.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/547b9c0939f84f0f3de99968225fe98b/17523159076.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3d8698e7f16a9d2d491f79a0b4d4bcac/69132613217.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f052ca7f---63285595044.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3fd8e8c450d820a3065860ba4f24cce7/81992669910.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/08b5819dbf4aff5ae661a893f322bb7e/15336988360.pdfIn PDF document text
- http://centroolosprato.it/userfiles/files/53714617121.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d5b65926f9c976419ad536e86a6f8a65/11263242050.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6a87d0e8b36ea0928b5b8aff9155d2f7/86514560615.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bbac4ee36---tesozonen.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb5089d8e2---rowoxa.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd640cc3c---32271681174.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7be63f128328ed5842c2d9a56cda7ebf/75258939073.pdfIn PDF document text
- http://turar-mussin.com/userfiles/File/wezakijav.pdfIn PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74e56ed19---60633587958.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44655eabf---bumigewabo.pdfIn PDF document text
- http://busangh.com/attfile/fckimg/file///20210704135647_154685596.pdfIn PDF document text
- http://geodez.com/pliki/file/wekelewidinizupola.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+ser+y+estar+nivel+a2PDF 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_off0000f444.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF444	18136 bytes
SHA-256: `8c8b247f10cc80a4178bcf1d8a7c9c00c019608c4afc87419dfa1eca3e83b3c1`
`font_01_sfnt_off000122e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013afd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AFD	10636 bytes
SHA-256: `d32aa25fd08fcb794c63628f67b1a2769dcd2c876b165b652053cd0b9c172a6b`

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