PDF malware analysis — malicious · 55eb55a9e4f830c7

MALICIOUS

PDF

72.3 KB Created: 2021-06-28 04:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 3fbbd6ad46d795ed35fcdaf85fe13bb5 SHA-1: 4b17d8025b689a6b2c3910fcd375de95e578a3d7 SHA-256: 55eb55a9e4f830c709a8591f86281d15cca2adb9538ca70c624427d6a26ef284

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://www.allatpatikapecs.hu/images/file/silulavezijivufejo.pdf In PDF document text
- http://tz5168.com/uploadfile/image/2021/06/24/file/20210624_221827_176.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077266d32791---89054052684.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd5fd8673---fipodemavepubofajatelaxi.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4690cf0f31cce7d245322ad6295bb2ba/57211299717.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e0f1f0c47e5c5a3aa2500b9d46ff3756/palazamuboluluferasowiba.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa812467501---55914612183.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/zulibukavekagafe.pdfIn PDF document text
- http://controldellaves.com/app/webroot/arxius/file/piramilezelimarikunot.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160789acee5bb3---lonaxelexalox.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0kgm5k3m08p2eljo76n19dkcgq/28854108301.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1022f47ba8---95584388179.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2e65daf13cb301e60930610fa24a60b3/781274874.pdfIn PDF document text
- http://nb111.store/web/images/ckfinder/files/20210611171229.pdfIn PDF document text
- http://banghetretunhien.com/media/ftp/file/14549861381.pdfIn PDF document text
- http://saopauloairporttransfers.com/ckfinder/userfiles/files/darogumikelu.pdfIn PDF document text
- https://sportsht.com/userfiles/file/wapewiguvufijuwofaj.pdfIn PDF document text
- https://hglobaltourb2c.com/FileData/ckfinder/files/20210627_7DD2252B6F88102B.pdfIn PDF document text
- http://amoy-art.com/Upload/file/6849181732.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0689e7a59---99248899925.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e39bcb2ad8d1fc9b13374b00a62ebea7/80536371454.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///33369246476.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/34f5e890287dd2c1852f416bb1c1463a/58924540972.pdfIn PDF document text
- http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab655d67f4d---93724940587.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0899df0a586f21dbdd50daec1672b2e6/wipowuja.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed58279b275c6fe4e7d9f05cd97c3a81/94699083278.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=party+house+uncensoredPDF 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_off0000bca1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCA1	15532 bytes
SHA-256: `8de210a05e68eb183549ce9cbf77069c36462b423e82cf68f3ccf8f9b1a0af70`
`font_01_sfnt_off0000e419.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE419	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fc30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC30	10544 bytes
SHA-256: `8e95276dc37af3cc91872336177e2010637dda9b31da1082f4894503bdf723d5`

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