PDF malware analysis — malicious · 8fa694848ae690f2

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 22:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 15b878006f5c932d852784f8f124e7e4 SHA-1: 79abd2ab3f92d5540e0893f613ed99c032351b37 SHA-256: 8fa694848ae690f2390ef33e39e02a1aff684d6288e7633ebc2353f698cf20aa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites or disposable domains. The primary attack pattern involves luring users to these sites, which likely serve phishing content or further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=one+thousand+sixty+five PDF link annotation
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k11fkd2bm1ao8hd58gg7le3iv9/97915702298.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/zabajazuvitepofilamo.pdfIn PDF document text
- https://rh4-h1tapi-turbo.com/contents//files/16211822019.pdfIn PDF document text
- http://aptchasers.com/FCKeditor/userfiles/file/83948546663.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0ead6211---rotapudanudirewumeri.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/bafaxefekolegelub.pdfIn PDF document text
- http://seednseed.com/admin/fckfiles/file/9400747579.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29e078fe7---17256823875.pdfIn PDF document text
- https://vegan-eshop.cz/data/file/gikenimexujudozomuxavafu.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f5c9fa13e493321532e8d089b50bc57e/30224263789.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1f47779c6fe6571e533fbf1e0b942873/50592637667.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc3d0097---xomewep.pdfIn PDF document text
- http://thangmayedex.com/webroot/img/files/mulapeposaxabuvobetow.pdfIn PDF document text
- https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c6c74f4c---domamisixumo.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/bojenitapufegegolupapenuv.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1c9b526fd8067394ab3d74c03853e48d/84348472497.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ur60b7ma3om55qarpf5kavv473/7325395946.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3dd265bde5b2305b6bd2fe22a2f2663a/pomiporolosazusitutuma.pdfIn PDF document text
- http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66654889877.pdfIn PDF document text
- http://filtrydokoparek.pl/img/all/23324901651.pdfIn PDF document text
- http://gemculture.com/userfiles/file/gamoxolilajenakoziwazutuk.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607234f8b947d---71989054074.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d528e74f08e89010b65beef67954c22f/4851996947.pdfIn PDF document text
- http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/damuruxapagobujobowagemi.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC2A	10712 bytes
SHA-256: `2247e372b667858593bede5cd944452378ed7617468efadf1b39f87d1abc13bd`
`font_01_sfnt_off0000f4ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4CE	16152 bytes
SHA-256: `a296b1387adcec6f3b2576628ea92b3d2a56d809f0e877613436961f86b2f7ca`
`font_02_sfnt_off00010a52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A52	17012 bytes
SHA-256: `3a0124ec1a283f26d74e71e0f8a8a6f4bf280e1b604e14b77d57fa20741d93d3`
`font_03_sfnt_off00013671.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13671	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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