PDF malware analysis — malicious · c531d18023d38cd2

MALICIOUS

PDF

91.5 KB Created: 2021-09-03 21:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: bfa4105e9ec9efa30a74183424bf7f27 SHA-1: b44dd1a52fd7072dc4e6d3588ea8d2a3fd3adea2 SHA-256: c531d18023d38cd243773c4e7fe22a47889944c3e91ca7f4d2521b38d939e6e5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a phishing or malicious redirection scheme. No scripts were extracted, but the presence of many external links indicates an attempt to lead the user to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

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.
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://synerhu.ru/uplcv?utm_term=hold+my+hand+book+2+pdf PDF link annotation
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f770b9c7050---70919930009.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3958e561b---18990067049.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53a2908b8---86859552444.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d7e359f6---lenulupatuva.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e69d8516b---zuvemumulugadaxebageri.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cqjolimkj5700hr91gcs6jtil4/xuxaluvakodabow.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161190db1f206d---68082743346.pdfIn PDF document text
- http://riggi.ru/userfiles/file/41315458162.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c119a46038---sotapatesimasag.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c5e42adfd---7663561039.pdfIn PDF document text
- http://sam-global.ch/files/file/gosoroledib.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff164af89b---96937978592.pdfIn PDF document text
- https://arch.ua/ckfinder/userfiles/files/nozogewivetafinu.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/df0d4vboujmo1nlu5sdaibbb4g/sawelidavedowugab.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826047a1415---durolawawilofofagopolozen.pdfIn PDF document text
- http://urparitet.ru/admin/ckfinder/userfiles/files/dizozolafizojo.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e40b21abc98a493ac3b32524136694b6/14053012748.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5400806d3.pdfIn PDF document text
- http://helder-effect.nl/userfiles/file/pexuw.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/10b3abcf71e3b9440a02879e599cf522/72499063521.pdfIn PDF document text
- http://np-laser.com/upload_fck/file/2021-6-29/20210629005750724763.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/62448559f53b2bc5e602aed77bf6f596/totakonulipape.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/6701364179.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2813aa1de28498a87c254288e86cd4a0/12096861372.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_off0000fdd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDD1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000115e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115E8	10632 bytes
SHA-256: `ca631fcd08f152eea209f63268e0ab8fe8e9e57fdc0744e953478d590544d3e0`
`font_02_sfnt_off00012dc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DC5	19340 bytes
SHA-256: `527ac7b5c45c6a04f4ed3345de0ad9fd89b55497be3cb4a11baae5d393dba709`

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