PDF malware analysis — malicious · ed0747b50d77e970

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: a3496f1154af0f39bbb46067c330621e SHA-1: 745cd227e3c30c8dd09398c97388323c877df3db SHA-256: ed0747b50d77e970466b74fda4bacbfbe7d0de6631b0b6bd14846c3094621c51

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised WordPress sites. The document body is unreadable, but the presence of multiple external and potentially compromised links indicates a phishing or malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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 http://phuocthuan.vn/images/pic/file/1924944769.pdf In PDF document text
- https://alwillislifecenter.org/ckfinder/userfiles/files/sukixo.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4c32a03f---lenuguwaraku.pdfIn PDF document text
- http://ahjygjg.com/upload_fck/file/2021-9-6/20210906174328186507.pdfIn PDF document text
- http://ecohort.com/userfiles/files/28742450142.pdfIn PDF document text
- http://ttccid.com/userfiles/file/34066966783.pdfIn PDF document text
- https://7mark3t2-7aya.com/contents/files/61724918217.pdfIn PDF document text
- http://sakulchaiplace.com/Uploads/file/73256803353.pdfIn PDF document text
- http://sake-tori.com/images/library/File/poxajikazujuxog.pdfIn PDF document text
- http://cuacuonnhanh.vn/Images_upload/files/xizeropozatofuta.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f00245e3---29233713317.pdfIn PDF document text
- https://fcksa.com/ckfinder/userfiles/files/xuzitid.pdfIn PDF document text
- http://lanaecoloridabruzzo.it/userfiles/file/4646588676.pdfIn PDF document text
- http://cassotech.nl/site/data/ws/files/48276292413.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131feb54f9cb---relalukixonitoz.pdfIn PDF document text
- http://dvif.fr/userfiles/file/90071524166.pdfIn PDF document text
- https://keluargamimpi.com/contents/files/70109404920.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ddd9b651f8ce3988946b3b6771d76b/fuxujebapavidezegurasamew.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=www+amazon+com+android+app+storePDF 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_off0000d98f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD98F	10768 bytes
SHA-256: `cc3a36a7e2a926d78c49835ef149ecf764f5d648d361b5323a6c5ff6a7813346`
`font_01_sfnt_off0000f26a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF26A	17084 bytes
SHA-256: `564097f57bb036bf22e57dba6c4198bce3f86581185913f250864baaeef6c614`
`font_02_sfnt_off00011e81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E81	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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