PDF malware analysis — malicious · 921104256da7ec30

MALICIOUS

PDF

86.6 KB Created: 2021-07-14 05:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 891b4168545242a98f1356bedebbe84b SHA-1: 37c5c20ef80bb2be3aa7b4f4bceffbc969c6ca4c SHA-256: 921104256da7ec308ff8fc7af82ce34453af49e4c1d0baefc181135fd4f431d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://coretry.ru/uplcv?utm_term=the+perimeter+of+two+squares+are+40+cm+and+32cm PDF link annotation
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1a0c281d---13967158854.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9f4c59c0---dudololimeforufizol.pdfIn PDF document text
- http://cn-junsheng.com/upload/file///202174141928146.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kl10575k82lfjivhlvbeuuhsup/2867474182.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ba21c930---2384874474.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97f82d290---74559911020.pdfIn PDF document text
- https://afmiletisim.com/resimler/files/dixokujuriwaj.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc165067---jivalufowegop.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/57916184a3b15a7d3b044c032c4fc02d/mogavabozubida.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eabf640ed---mowon.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec3aaabf3---zuxusipapoziw.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/uvpasftth27668bac6nekgnp09/zafiju.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/77001953019.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f92766c1d3a68dba7f9eeae4a4541c38/noxasejanega.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a07329baf---89298713502.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b9f6ddb7---80735592799.pdfIn PDF document text
- https://aksusu.com/upload/files/vikafefegobaviposujus.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d74f019e2---sorudozexagaregibuguleb.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/35c0ac9d7471b001adbbf5de3fc063c4/1336209564.pdfIn PDF document text
- http://wsm.hk/images/uploadfiles/file/93912568012.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af88049e9c1---42758932623.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7dc557d95---bipopitezidog.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f4f8d40a1918e50ddb7520b0678029e1/34288229471.pdfIn PDF document text
- http://gnatowski.pl/attachments/file/11624317250.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff795bb966---vejew.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_off0000eb43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB43	17744 bytes
SHA-256: `69aea0dbc5fc17af7c1e4b199dd106200656a6a037a9240de281448f8ac48106`
`font_01_sfnt_off000118c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000130db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130DB	11628 bytes
SHA-256: `62fe920b4f14aa561b414c56defb06bf4f474957d342568e2c3b489ff902f74b`

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