PDF malware analysis — malicious · 618ddb7998f2d6e2

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 01:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 823a45c68a42c1636808887f06d0436a SHA-1: dbc518d06e856b6b4998b882d3944c716b102e67 SHA-256: 618ddb7998f2d6e2270f3c7f068c3c3dcb55b101ad217840d92d0ad3c3fdc91e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=comdial+impact+phone+manual', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://smidgel.ru/uplcv?utm_term=comdial+impact+phone+manual PDF link annotation
- https://szekszardportal.hu/userfiles/file/7343831209.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5ad206b0---baxixadedu.pdfIn PDF document text
- https://sportsslife.net/upload/ckfinder/files/57760338518.pdfIn PDF document text
- http://lukinserv.hu/file/84022427159.pdfIn PDF document text
- http://griswoldremgmt.com/uploads/files/serilakokav.pdfIn PDF document text
- http://fulepmark.hu/nyebu/fulepmark/userfiles/file/luzafitigu.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6142ed0a8c130ee38d965894d5dddac9/95842808486.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/vodonisifedojuni.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210816193615_gm9sdc.pdfIn PDF document text
- http://stringpoets.com/userfiles/file/sizovenuxadokaximebiziji.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c22137de4---xazozupawuroxitimepex.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7bb8e157---85191823695.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608562a55ff85---gobinoripojuva.pdfIn PDF document text
- http://bjsprt.com/uploadfile/file///2021062805383729.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ad4da8e4---duwulugutelejupadetab.pdfIn PDF document text
- http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/48575859462.pdfIn PDF document text
- https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/kcf8bpgfipjp81vshhj15h43c7/mosulovixegabupakajed.pdfIn PDF document text
- http://childhood-matters.com/clients/49507/File/sotaruwakusebawijazemosa.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687c25b13---9097424989.pdfIn PDF document text
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/164e46cc0e64db6f89c4769de1807fbc/tupedizot.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7bedd4262ef5750ddc814c10c4370b37/8026817329.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/vozuzigekotamo.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5aceaa81---xalovodofemevex.pdfIn PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098371247b3b---84618264432.pdfIn PDF document text
- http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/kaluzowuvumixaredix.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123f9399b3ce---12510961598.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_off0000ea88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA88	17948 bytes
SHA-256: `4bd74416b60ae870284d0475a1d7f0b025cd9cce6edb60b72ea9e7462e5a8365`
`font_01_sfnt_off0001198b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1198B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000131a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131A2	10644 bytes
SHA-256: `df5ca4d7c192021e3573e9209b307f33881c9271ced8acb6c1104740467c1d89`

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