PDF malware analysis — malicious · 37e4befb65ab3c9a

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 08:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 139c7c452506b0115e024fac02a49544 SHA-1: 3c27578caa00ea00c4391bc754af210942440d1d SHA-256: 37e4befb65ab3c9ab8544b3b518b4acf8858d5bea9bf130d148730d423ed997a

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=arithmetic+sequence+steps PDF link annotation
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a883d873---jifepasevujuguxe.pdfIn PDF document text
- https://eternalbliss.net/file/28091966067.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b4fc334a---59642902118.pdfIn PDF document text
- https://kopari.hu/files/file/vogokoxani.pdfIn PDF document text
- https://laughteronlineuniversity.com/images/upload/files/21184460837.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b9898c3f1---jinale.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c9cf71e9720f0912e1b03c2a0d71779f/xewubifax.pdfIn PDF document text
- http://klimatyzacjaradom.pl/userfiles/file/gokoxiroziduvofe.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/881368015f9b2af115d9ab15edc42e61/2304859080.pdfIn PDF document text
- http://hiro-seiko.com/upload/files/wibatutoduxat.pdfIn PDF document text
- http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/65361480557.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917f5673ef3---76896417849.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/99726566617.pdfIn PDF document text
- http://emilygrilltogo.com/uploads/files/nudefejebabuzigam.pdfIn PDF document text
- http://ordinate-ltd.com/file_media/file_image/file/6758286690.pdfIn PDF document text
- https://autotrans911.com/thread/admin/uploads/file/93216804647.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e94517f0a53a7c0a9eab6b49f1dec109/xipojinakovifadiloka.pdfIn PDF document text
- http://angarakshaksecurity.com/userfiles/file/lozetevazidonut.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/19395840817.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c770d81b59---84661159498.pdfIn PDF document text
- http://48bulls.com/js/upload/files/58548819033.pdfIn PDF document text
- https://bem-sa.com/img/file/60057896148.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161135bb34697d---jidurasefitodamob.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607156cb2c90d---9058858237.pdfIn PDF document text
- 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_off0001014d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1014D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011964.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11964	10536 bytes
SHA-256: `9030f03114b9e90b585e29b45ca70b0577c1d55879ace0fd408409d92fd12f86`
`font_02_sfnt_off00013137.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13137	18740 bytes
SHA-256: `517fc79673f54200e30bb03df167c670219518fb577e3498c36412feed48ccf1`

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