PDF malware analysis — malicious · 855f5f1f677786e5

MALICIOUS

PDF

88.2 KB Created: 2021-06-25 18:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 842a9107785013d08833579bda748055 SHA-1: c90c1b781a0c73fa9cb8bc7f1aeb9809e65e35ec SHA-256: 855f5f1f677786e59bcc059d7a97e2554d5c1f699a36102a36859da68734d25f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous PDFs on compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4de06df55---13767592747.pdf In PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238cd3ef0a---lowenabumumewevapasobeno.pdfIn PDF document text
- http://foto-klub.dk/userfiles/file/2471745538.pdfIn PDF document text
- http://provia-events.de/pics/fotos/1/file/vipefog.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c39331c207eeb3cb24f21877b3cf5c8/lijetaxomesemuvopamolanun.pdfIn PDF document text
- http://4bx.pl/public/file/36203748048.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083987e0c916---ruwiki.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe2c9297b---27609916730.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bef60132d09---73572725137.pdfIn PDF document text
- https://aedwea.com/upload/foto/revex.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5kbq59un428t6pdjascml8vddg/36389765370.pdfIn PDF document text
- http://xn--80an2aej.xn--p1ai/up/file/85148357913.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f07fb509e---78987511862.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/it2taqp87qd4afpg52dutf3br4/popogetarefibogidujaguna.pdfIn PDF document text
- https://towa-aaa.jp/userfiles/file/numumujuxarixulaz.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/963d67da8b65c37eebe2c64119b367c5/sufesegoxabulaje.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/404bd3d4913a5689ce319808b7a9b421/xexoworotuzekunagon.pdfIn PDF document text
- https://mobilieroccasion.fr/uploads/file/97013627019.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef676c99b8ab27ee5da771dd889d8d71/zatizafojovudofojisa.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2adc4ec3d2993d5c578f201d135a264b/rijazebamilijewewinuwajez.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d19c607cb8ca06bfb31bd7a7930ec637/54445280851.pdfIn PDF document text
- http://mwflower.com/upimagesfile///dotetufufuwoxasogikesu.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6c30ed665ab8d3a7b7eb72074903c977/6151987439.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/60b4dc23ed7465270a5d84a58f25b74f/61695951380.pdfIn PDF document text
- https://easypayindia.in/userfiles/file/sunotitazuvo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=finding+crappie+with+side+imagingPDF 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_off0000f738.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF738	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F4F	10856 bytes
SHA-256: `71386b3f7c6ef8b945f6cc428761dc70c71bd5afad061387c0cbd41b12ef556c`
`font_02_sfnt_off00012801.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12801	16784 bytes
SHA-256: `f1519eb99bbae9e2c99f747f41099d2838d21e98cb61d0a0d8cb4cc9757bfac5`

Open this report in the interactive analyzer, or submit your own file for analysis.