PDF malware analysis — malicious · 6117ef5055e3d217

MALICIOUS

PDF

91.1 KB Created: 2021-07-23 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: fd8407b0dfa1788caf9fdca77d7319d8 SHA-1: 91e3d6cb32c20db1ae55aee4b088590c668483bb SHA-256: 6117ef5055e3d217bf316233370c06817620f950fa65cf43a46970afb4eb7925

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, potentially to phishing sites or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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 https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/236daeace5e5a71840cad0b88ea0cf5f/12095318168.pdf In PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cdb4d87ce---rumumikixe.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/nlhv0qt64fsikf2r6nofqasqkf/56033942460.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607247c5eefb5---34401405684.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160888b1c01a67---katisodemever.pdfIn PDF document text
- http://n-production.com/upload/fckeditor/file/91464882852.pdfIn PDF document text
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/69229c8437ce8b8d676b979b1e02643f/xigemalem.pdfIn PDF document text
- http://truhlarstvisollner.cz/data/file/62272724872.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7380115393---74494484068.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i7tq4rag6smr7gke3fp65qlea5/giruzogurebexopevi.pdfIn PDF document text
- http://goodwill.as/userfiles/file/28775432763.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bc084468---8604969455.pdfIn PDF document text
- https://sieuthigo.vn/upload/ck/files/dotinegemizafenaxegenar.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7b05d1628f653dcfe66ad72ac55661af/88038789081.pdfIn PDF document text
- https://edubox.mn/uploads/users/0/files/fivatiwujogezudumodanot.pdfIn PDF document text
- http://oroblupiscine.it/userfiles/files/69249862573.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34d813fe8---59964423697.pdfIn PDF document text
- https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/dd3fbb89de3332aa56fb578df9f8a3ea/vevuwozatefozaxojepexelej.pdfIn PDF document text
- http://aapltd.net/userfiles/file/34612324170.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed828c51c---fewowivetufuwib.pdfIn PDF document text
- http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/98946898448.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f53f7317f---naronosaguzolaw.pdfIn PDF document text
- https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/judajasodufikejazakovona.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b248fa8a982---lobuz.pdfIn PDF document text
- http://geerhannutpourreussir.be/docs/upload/files/18851870796.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a71e6d99---37376660291.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/de85cc1810624a2693d7ca347ff4283d/73498720169.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+a+discord+bot+python+2020PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f39a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF39A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA7	1696 bytes
SHA-256: `28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae`
`font_02_sfnt_off000113b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113B3	17884 bytes
SHA-256: `0308bd07d6a8a403f8fe38fb3141ee94a251bbd7fbf1e6ccb444fdd15222f7f3`
`font_03_sfnt_off000142ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142EA	11400 bytes
SHA-256: `6f36fd8771e8f50f33fc7ea5569ab82b78c14b8a07d431e9905d45dcea9353c8`

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