PDF malware analysis — malicious · c70ee8b7a63b88e3

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 22:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 3dd912687aa5d18bd5b97ac04748da51 SHA-1: 4f3c02e575cdee70c565dd782198734f9b172b3a SHA-256: c70ee8b7a63b88e3049901c96ee3f64f383b5a5a1e6b8f0893bd06884f64084e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=what+can+be+unicellular+or+multicellular PDF link annotation
- https://gujaratisamajparis.org/upload/files/64346482653.pdfIn PDF document text
- http://universalgroupautos.com/files/others/bowefan.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3b8e799ad46a316667afaf8cf6f1a7a8/58875028591.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806213503a4---13481716302.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2de1a6529---91166606840.pdfIn PDF document text
- https://stvorki.ru/files/file/81926347847.pdfIn PDF document text
- https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mobotiluledavapotu.pdfIn PDF document text
- https://amursvoidom.ru/media/files/luxebuzevogomikunip.pdfIn PDF document text
- http://media-production.net/admin/ckfinder/userfiles/files/vemenidebodom.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5687a8087a---47798580462.pdfIn PDF document text
- https://summit-christian-academy.org/scauserfiles/files/bogoj.pdfIn PDF document text
- https://umartravel.com/files/45859913932.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20bd6a568---52131064632.pdfIn PDF document text
- http://longarmquiltacademy.net/fckeditor/userfiles/file/laveredasuleke.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12c9ede87---xinusefaxujaf.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/48446761536.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5700e82f8d6b135d7707d06d0beb683e/sirosurujabime.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7664ca1b9---bozafujuwetinomegilurevo.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/72aeb37461517e8b79aa8531db4be43b/2440461665.pdfIn PDF document text
- https://vigiweb.cl/dinamicos/files/file/79754190885.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a0deaee6571dc79d026fea36a8a86102/68800927221.pdfIn PDF document text
- https://cursosadistanciayonline.com/medios/files/55815558391.pdfIn PDF document text
- http://broorybulldogs.com/clients/33993/File/93638737453.pdfIn PDF document text
- http://finchamauto.com/pics/36677710684.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2ace50dd1---47755492568.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_off0000de5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f671.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF671	17452 bytes
SHA-256: `e5c6987fd921a6f81a7251a44412e88e40ef3d08db02ea142863c10b8c99c200`
`font_02_sfnt_off0001232e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1232E	10560 bytes
SHA-256: `b496f7086811bf5e55c9770ecca868e3a2bb412a265e0f8b1a59d39b79102607`

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