PDF malware analysis — malicious · 711f665be66f2c30

MALICIOUS

PDF

89.9 KB Created: 2021-07-21 09:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 35681d6b640ff549cf420bcca499eb39 SHA-1: 5e21dee6dda9cd806b0b3d2f91592d6dc5a56ba2 SHA-256: 711f665be66f2c308f9e95bd25b0c30300e9f7522a39d0817ecb5f23b7263f7e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to a malicious payload or phishing page.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
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 http://diversecityuk.com/userfiles/file/vugorirufuxunoxe.pdf In PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/45bacb2914b1920acabe5166e00aba75/gimod.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4343a714992d12c815d2b2c16a40e269/2684939741.pdfIn PDF document text
- http://primehorseproperty.com/userfiles/files/80794805452.pdfIn PDF document text
- http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/jurud.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff67d4129---rusog.pdfIn PDF document text
- https://argumentua.com/i/file/kipibevirotowifasodukixar.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ae9994ae---15829813744.pdfIn PDF document text
- https://ctapigroup3.com/contents//files/68858060091.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ea965e8a05a40dca9b5070bf8b012a23/dawarobetupolidupanuf.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3a139b04---51513062774.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f870c37e8---lalod.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f203689d76f19d19a0c5d582a5bfa7d7/9807537960.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785c0b689c8---pumokan.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce3e99e90---litodivosorigewunide.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da26ad25c1---88682734781.pdfIn PDF document text
- http://abwlanham.com/uploads/files/vulufapixurufofaxawa.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ecd0508f---gunatajukofopemozajuxalu.pdfIn PDF document text
- http://wildpflanzen-planung.de/file/jiripelibonojagipenifoji.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5372587cf---kakazajeratozobor.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/chherl4l13p90bjk7uu4dn3pv0/64553285613.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a5b891827---1496471407.pdfIn PDF document text
- http://nessium.fr/userfiles/file/53665951660.pdfIn PDF document text
- https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a5fd4be0c1a06d095694705d040d3d9d/tivipemoz.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/c4c3302cba4596552727df903f12fb28/70437288418.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=total+physical+response+principlesPDF link annotation
- https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/fuderaboraribonivopiwuvu.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_off0000fe33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE33	16840 bytes
SHA-256: `e29451986184987134c006254554b02dd72959e17371a356aad81ff2a0a7af04`
`font_01_sfnt_off00012a06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A06	10548 bytes
SHA-256: `68ba3abc9f8768eb0e5bd9c79d0e1e8e1c6a723017f66a655a554941f83667c1`
`font_02_sfnt_off0001421c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1421C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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