PDF malware analysis — malicious · 665ff625a917c9f9

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 22:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 243465341cbc228721d991ce3c7a17cc SHA-1: 3774de35b5ca2e5203d4a51f2ba20dc2849efa27 SHA-256: 665ff625a917c9f92cc7ae60632d49162cea6040d7ad3f89ed3913403b5ec3df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. Heuristics indicate this is a link farm, likely used for SEO poisoning or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qo0cmtjfh1122d9f0hm8hq24t9/69348792537.pdf In PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/fagiwavivusifaroziroladu.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/aa0d6e63810dfea8d7a0a0c2530d6852/973568614.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/95o0351c6sq4fhjqjpcp6hd2jv/64550623702.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5833abcbe---17136288902.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/fae0d2194d759ea45c64437f36f79314/71734915980.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/54526411995.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6lfgpg7aug47dp56feaj9ft67f/judafew.pdfIn PDF document text
- https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/809899f7a6410e7fcb23bb79b3bc07e3/gitubixozuxevu.pdfIn PDF document text
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/089c1717b837dc1a3b3c4ef30288a324/85812924463.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r672gfb2gpui1pq9uqp57hi96a/bijaxef.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cca39116751---57473231470.pdfIn PDF document text
- https://xo-sound.ru/userfiles/file/57378288765.pdfIn PDF document text
- https://mauspro.net/upload/files/wafivepitaregizaxoxapo.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073313ebe3ca---64158316364.pdfIn PDF document text
- http://aloeverajuice.cz/files/file/98230401187.pdfIn PDF document text
- https://synersys.fr/contenu/file/36192125512.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780dc34e4bb---57378842236.pdfIn PDF document text
- https://nhahangthanghuong.com/uploads/files/nujekumixe.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7296849b8d---51162987539.pdfIn PDF document text
- http://droprint.my/home/ququ4923/public_html/userfiles/file/tupowawuguxez.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160aa6020c7---5971793812.pdfIn PDF document text
- https://anjingliar2.com/contents//files/77744022245.pdfIn PDF document text
- http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63763372892.pdfIn PDF document text
- http://sushinamu.com/uploads/files/wusozabiwimuxiveguber.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c60c8aba5cceec16bb11542e19bae70f/nituzapawemaxefomudaba.pdfIn PDF document text
- http://sriagasthiyarastro.com/FCKeditor/userfiles/file/wunuvuwafawosafulajibose.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/lidizulefurut.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bibiliya+ntagatifu+kinyarwanda+pdfPDF 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_off0000d04b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD04B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e85d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE85D	18100 bytes
SHA-256: `8dca31eda5f2d89adaa6546f1050a5b15586a8960056256f0e40fd24556b4343`
`font_02_sfnt_off0001177b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1177B	10840 bytes
SHA-256: `258ef74ce80460792f7b6e4154bf881558eb1208b6b75655726a9363973771c8`

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