PDF malware analysis — malicious · b08db31e7b60a59f

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 13:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 39902dd6ae576282632bd5f32fd0de6a SHA-1: 0cb015bdbc0cae42675e464be20bb8c6fe23adf4 SHA-256: b08db31e7b60a59f9552c84c6da266235a6a427faf602d59c726baa0a4e6b320

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites that host further malicious PDFs. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample, but the overall structure and URL targets indicate a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/885739f36494cbafa997ba899137ab50/melatoxe.pdf In PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/81b4bd68806038822920bca98ecafd0c/3074404371.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rstphp9rdup8nhlkmeeke2ptd7/71733442168.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a1c53c00---jedimukurufubapav.pdfIn PDF document text
- http://astro2sphere.com/admin/images/file/sufifetenurujowob.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1c13926f16c8aebca1141cd30293af6e/32487639087.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ad33001584bac156b0aecd44a2c7ce7f/6042744885.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d435f3eb85c---japosagoxisuxive.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a8fe1c764c26f7ed6e1e9850a9679e12/36214562915.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3887235365a72031f015add542a60d24/xugewuxemeberonusunusavo.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82709b496ce557ed7bf2ecd53d4d3cef/pubafixipote.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/xudilojumudepira.pdfIn PDF document text
- http://etabetasurvey.com/userfiles/files/17534661652.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d23257a---duvovesavaluliraxa.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kr1e09c3c0fr84ib0lqdji1352/1651449963.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d2ff4c7384f44446a91f1a57ae61146/rebeji.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7c6a6f97b9e54555dc6e57ad04786ebe/jetimogodoxekozopajabase.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160779fff4f7c6---78413693313.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/73177022931.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae09f3ad60---99691668569.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/68264804811.pdfIn PDF document text
- http://usmleworkout.com/files/file/fefaxefejiki.pdfIn PDF document text
- http://agrobud.net/uploaded/file/39587935013.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c330a868b91500940dbdd4b4374b82ce/97342174167.pdfIn PDF document text
- https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/384800964c63485ce795538e80959c61/xususuragaxas.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=three+principal+views+of+orthographic+projectionPDF 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_off0000dee6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEE6	17020 bytes
SHA-256: `8f7d472975a3fdb58298ff108957762b339caf06503abb3bfc0c7d6da18ebad1`
`font_01_sfnt_off00010b35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B35	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001234c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1234C	11004 bytes
SHA-256: `e304b5a0a0f90bacea9e31e0817307c1d47a806856470cb6f1d3c773e9f306be`

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