PDF malware analysis — malicious · 8f843d7ea3a89e82

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1599fc6d35d867a20adb4436a23658b3 SHA-1: 6ee0776eadd9cb2e36367f1d2ff176f166f2a17d SHA-256: 8f843d7ea3a89e82061ee78ceb869070f3afeeec3b27600b1bf7cdb12bd509ac

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These redirects are likely intended to deliver a secondary payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://blokhol.com/upload/files/98307882008.pdf In PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828308917ea---24084823788.pdfIn PDF document text
- https://ewt.cz/res/file/31089108273.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b2c0eeb5834ae5b0f99e28b60fe561e9/xexorujofewibelanubiki.pdfIn PDF document text
- http://arcdesantmarti.com/biocop/Images/images-editor/file/zawanoxebolo.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/tilokinorawow.pdfIn PDF document text
- http://vivatbacchus.hu/files/file/rirarifizodijagora.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kasivafofafukivegatidag.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/isn028r4nliucn6ujeldb11i84/84708349632.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed1831fb39---4617732488.pdfIn PDF document text
- http://maivietnamesecotati.com/uploads/files/pofuku.pdfIn PDF document text
- http://canadapremiumlubes.com/survey/userfiles/files/gobed.pdfIn PDF document text
- https://rdsdealers.com/ckfinder/userfiles/files/41109400642.pdfIn PDF document text
- https://rafautama.com/uploads/file/55695048122.pdfIn PDF document text
- http://ytovietnam.net/ckfinder/userfiles/files/13162454373.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6370889c1---wavajovezulon.pdfIn PDF document text
- https://topupdana.com/contents//files/wegeruj.pdfIn PDF document text
- http://leinerpakgelatine.com/survey/userfiles/files/74220923883.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gahi1d8o6fspajo5e1h1g33800/10873732747.pdfIn PDF document text
- http://joy05.com/_UploadFile/Images/file/miwijedizuve.pdfIn PDF document text
- https://igruppe.no/ckfinder/userfiles//files/40614217412.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc16b4421eb---27107305233.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1bdd1102---87428567992.pdfIn PDF document text
- http://cheers-gifts.com/userfiles/melezibetiwivakozoj.pdfIn PDF document text
- http://spy-military-labs.com/userfiles/file/4369808178.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=maths+revision+ks2+year+5+worksheetsPDF 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_off0000bf47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF47	10764 bytes
SHA-256: `4154144b8b8527b2574e59b856bd4ed31603df4db9f9c9264bd5b8e31f61c171`
`font_01_sfnt_off0000d834.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD834	17040 bytes
SHA-256: `eafc76f3f776edd912d7e7c96f8b94ee96f882ff89d20ad7969461f0e924799e`
`font_02_sfnt_off0001035c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1035C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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