PDF malware analysis — malicious · 176cbafdd5754459

MALICIOUS

PDF

92.3 KB Created: 2021-07-19 01:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 0fc4d5b021cacddefcb88c75989dc892 SHA-1: 42ebf68f6f28bf2ae0fd283734a6ef3a0e23f66c SHA-256: 176cbafdd5754459d887ea18fc480774d141500c745dd1a2a9e0dd3ee204b87e

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier strongly indicates maliciousness, and the overall structure points to a downloader or redirector pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/68079b9f6b0d4de9c93a3836d907208c/94239141385.pdf In PDF document text
- http://dentherapia.hu/files/file/lunikiw.pdfIn PDF document text
- https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/9fppprpnakvpse19v7ifdpr01p/8580366241.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6789ca8358a78856c837475284cbe385/14768077839.pdfIn PDF document text
- http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/veverip.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/02c3c09e264703843ac4e6d5f0c22f8d/julijofikiwaduraguv.pdfIn PDF document text
- http://delve-cr.com/uploads/83171880526.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a1832ba471fce124e7730fbd4f0a214e/36622383558.pdfIn PDF document text
- http://pi-consulting.ch/download/putosoranefufadapo.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/62510482722.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7188bb6469---novat.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff050d4d96---madurefixadikarekapog.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071310b7f8fb---dasoped.pdfIn PDF document text
- https://bem-sa.com/img/file/fodoxepu.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/minuweriwodexe.pdfIn PDF document text
- https://uetty.xyz/js/ckfinder/userfiles/files/58056346776.pdfIn PDF document text
- http://doubles301.jp/files/ckeditor/files/xumunabuxivej.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24771d2cf1---8974390053.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7ab4c29e1adcc58f70ef2bfc0a91669d/13121892125.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b142163f97---gibuxewaz.pdfIn PDF document text
- https://norservis.com/files/files/bonomupijafusadupetet.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607192ce07ae2---kakulosekewaxisiz.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f651cdcd---samopekobuvupesesidafe.pdfIn PDF document text
- http://goldenbaycruisesagent.com/userfiles/file/4866774168.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088261a03f2a---wivotevarowod.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/19f6b0b1b345e58e495e7ae9f17d00ea/rixasowufijexalonolekik.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/nusalevokemam.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mashed+potatoes+with+bottled+ranch+dressingPDF 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_off00010203.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10203	11012 bytes
SHA-256: `6ef21e5505811176ca9f3c6882a625a2b23f44011bcef48619444d690c9881a5`
`font_01_sfnt_off00011b2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13341	18400 bytes
SHA-256: `bce34bdfd7bfc28b865b832348c949c1429a865b286dd84c39e5f4adca216927`

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