PDF malware analysis — malicious · bda103eb6f7a6f82

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 05:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9ce705adbd1ad0cee20a436643b950e1 SHA-1: d77a9e4d9f09d7b7b7826f5b694e6aedc4e8d1c2 SHA-256: bda103eb6f7a6f82ec6c102de4fc9fc0eb9c1123bcb2994e80988ee42b8aace2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF structure itself does not contain readable content, but the heuristics and URLs strongly suggest a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://frezerovka.by/images/fxeditor/file/67303029348.pdf In PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2542a92605a2af2501bdd1e5058db8c5/9744491906.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607462aa1cd5e---mutidinexutufadas.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/fagumurorupuwefokujub.pdfIn PDF document text
- http://flagrant-desir.com/userfiles/file/lakekizavisodakumutivalo.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a109025b834---kikijitazipojabuvedumud.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d6175598e867cb04a11ce3ef6d73cac9/niramavevuxarodufude.pdfIn PDF document text
- http://lapenya.cat/imgjovesnaves/file/nizarovejokutagu.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/zubuwatetusas.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jo79fjdgsi8i46phvh11o4v0t7/98080212915.pdfIn PDF document text
- https://deesudcoolingtower.com/userfiles/file/labibapofasobudov.pdfIn PDF document text
- http://satunatc.ac.th/ckfinder/userfiles/files/77931686521.pdfIn PDF document text
- https://wolfgang-photography.com/userfiles/files/sinekuninodezidorugidara.pdfIn PDF document text
- http://bluecars.pl/userfiles/file/xuxisevabonagutemiwuxe.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4354d2c07---82577822195.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73b5319274e90134512cb6af59109eae/79365630525.pdfIn PDF document text
- http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c936f2ec9078cecf1b15611b6bd75c3c/32740827352.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210522115501303.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea50a93838---pifalofigifadopopi.pdfIn PDF document text
- http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/85592154003.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bf8c793e---21075558150.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e10a6870c853f363cffab7a366c4735/43525059994.pdfIn PDF document text
- http://bioident.pl/photos_fck/file/91408993159.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/69h4p8bd3hg24s1vm53022b8i3/42173813227.pdfIn PDF document text
- http://jyjwqj.com/uploadfile/file///2021081008422660.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e4f11c192d0d8d11012f4a30c0684a2b/46742471701.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=which+blackpink+song+has+the+most+englishPDF 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_off0000e2e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2E7	17968 bytes
SHA-256: `8d388b7bc3c65f23b44d1df0f01861736e612965c836836c68b8bfc0d34185e7`
`font_01_sfnt_off0001118e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1118E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000129a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129A5	10948 bytes
SHA-256: `e759fcf0b388a7d8f33c52ce387d9aadff6bcc142d3494ab84830deba000f772`

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