PDF malware analysis — malicious · caef51f90e211e70

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 17:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9258044cd0fb10a81a312f055e98304d SHA-1: dfd91c673643826cb2b344c7ad7e8ee6a875e317 SHA-256: caef51f90e211e702808c2cc2448129b4647613935d02d6bbf6961a49df4e93c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

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://infrive.ru/uplcv?utm_term=stericson+busybox+apk PDF link annotation
- https://joinvita.com/neu/userfiles/file/17162256964.pdfIn PDF document text
- http://mopron.ru/upload/files/56802009247.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161459bececc0f---31934835141.pdfIn PDF document text
- https://mbamantra.com/ci/userfiles/files/rapas.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/88919651663.pdfIn PDF document text
- http://perfect-gallery.com/userfiles/file/pojuwofixomutoku.pdfIn PDF document text
- http://terezszilvia.com/images/uploaded/file/kigazisoxuxak.pdfIn PDF document text
- https://centrorevisionimonregalese.it/file/56952728121.pdfIn PDF document text
- http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/43153299023.pdfIn PDF document text
- http://wxbeimei.cn/upload/ckimg/files/202109061647527584.pdfIn PDF document text
- https://www.tyrtaios.gr/ckfinder/userfiles/files/tolirupasa.pdfIn PDF document text
- https://x-software.cz/data/file/wiroludujapubilig.pdfIn PDF document text
- https://dichvuketoansg.com/luutru/files/10275050155.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/850b43d5b2db294dc93d63fda63d6bd1/80044219060.pdfIn PDF document text
- http://totoumi.jp/upload/file/99572555726.pdfIn PDF document text
- http://gdwtechnology.com/fckeditor/file/33738438809.pdfIn PDF document text
- http://urgentcarepb.net/userfiles/file/24422061899.pdfIn PDF document text
- http://sissonne.hu/editor_up/6315734378.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bcd9e4e7907f7580b7c52ebc5cfefbea/90688629846.pdfIn PDF document text
- https://bdblue.com/ckfinder/userfiles/files/vuwezaro.pdfIn PDF document text
- https://afritransport.com/app/webroot/files/file/puribudifojineramizus.pdfIn PDF document text
- https://moyaexpresss.com/ckfinder/userfiles/files/93967357032.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5b98h9cbmv6d27b4hq6h1icj6m/18480870256.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5523a29eb---25099533461.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_off0000b2b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB2B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cac5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAC5	17448 bytes
SHA-256: `3b651bb474bfa790ea27e24023da3b63d4da2b3fe11722d05604d2492d0411ff`
`font_02_sfnt_off0000f7bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7BD	10944 bytes
SHA-256: `603cc821dd7c3b339a283e66be664cc3bc29899e4f062e6dbda801f65ec313ba`

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