PDF malware analysis — malicious · 45f90bcc97e234ca

MALICIOUS

PDF

69.5 KB Created: 2021-09-03 00:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: d1e56ccce3c464958a8030b869b11451 SHA-1: b7e7a0af06e239bba266fc4d90d97c59383a6a07 SHA-256: 45f90bcc97e234cae2ce1a34bcef361f7d30667daeb6920625436458df7b7016

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=11th+ssc+physics+textbook+pdf PDF link annotation
- http://nhhs78.org/clients/63854/File/47478035594.pdfIn PDF document text
- http://mcap.cz/images/uploadedimages/file/guxubujuzuzif.pdfIn PDF document text
- http://adveotec.com/img/file/gakeripexukoxifekos.pdfIn PDF document text
- https://ekselantechnology.solutions/ckfinder/userfiles/files/dererute.pdfIn PDF document text
- https://derey.nl/app/webroot/files/userfiles/files/69640908679.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d9be6dtpun9di6fvnlq6scs1b4/23901132967.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/56657139633.pdfIn PDF document text
- http://skncn.com/u/files/77083675204.pdfIn PDF document text
- http://agisma.ru/files/pages/files/suxozesola.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c804e5f48f7fd092ab78c364e22f0e5f/muzar.pdfIn PDF document text
- https://heatingboiler.ca/fck_upload/file/dolekatudufelijogomukevap.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aab9fcef787---dojitiwite.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb77825c3---fanojelesolejewuvoxasorum.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/rusalefofinoba.pdfIn PDF document text
- http://onishi-kyosendo.jp/archive/3286005786.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d79b8609ab0---80109764834.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7vcv6dv11j567det2srggd79dh/52446923310.pdfIn PDF document text
- http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/wikavejufomedaf.pdfIn PDF document text
- http://emanuelarombiarchitetto.eu/userfiles/files/vuzuma.pdfIn PDF document text
- http://tootingtaxi.com/survey/userfiles/files/lujijodajakomifowat.pdfIn PDF document text
- http://myucpb.net/userfiles/file/bavodusemubililumob.pdfIn PDF document text
- https://davaocarrental.com/images/file/salal.pdfIn PDF document text
- https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/bipewikoraj.pdfIn PDF document text
- https://masterjobintl.com/ckfinder/userfiles/files/99360209230.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_off0000b07f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB07F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC896	10708 bytes
SHA-256: `5c530814c6654c6f356c666b3eb6a3dd4bece088c75e2420083c05773a2b0aa0`
`font_02_sfnt_off0000e129.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE129	15728 bytes
SHA-256: `8d5a1faefa73ff238e564e69f21586e73c3f6a7a329fbc90da6f9c3cdd47885f`

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