PDF malware analysis — malicious · a88e97d290aee19e

MALICIOUS

PDF

84.9 KB Created: 2021-07-12 17:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 50c4ce1de00c921e0d120889d19094b2 SHA-1: 31d95433c563c84a098239d80cbe4d9dafc7d3d1 SHA-256: a88e97d290aee19e94ecb8beadd629d64c8a6cac65f51f4b7c4330f611bd063e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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 https://infrastone.com/userfiles/files/50314265779.pdf In PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/aajsf6q45vj3sihgj9l20e0cum/dakakopojikulipijigoxi.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748d3b8ef40---bopaporigilevo.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160788bc8b62fa---varafulabulepaloxa.pdfIn PDF document text
- https://airbays.com/userfiles/file/tonugusuni.pdfIn PDF document text
- https://global-brand.net/userfiles/files/10107339717.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e57420672---54797846470.pdfIn PDF document text
- https://feldmann-spedition.de/pics/userfiles/file/fumovigasovubenukafelur.pdfIn PDF document text
- https://addsfly.com/userfiles/file/6214327502.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/48fea1a44282caca0e9b375f59d29ebf/waxupit.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61083273f---7234660766.pdfIn PDF document text
- https://hogies.com/includes/template/uploads/file/65996960439.pdfIn PDF document text
- http://euro520.net/userfiles/file/1622526203148746332.pdfIn PDF document text
- http://mictrogiang.com/userfiles/files/22696207477.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/woralisixo.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b84717c6200---99649468307.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sfp0sfpvhn15aabis8hk5ou1o0/luvapegexajugixamejir.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1e148f0b---sevofipulinisudedisuv.pdfIn PDF document text
- http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/30268168210.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4f1324ec1c57434e568f0adeb09735b2/78888523950.pdfIn PDF document text
- http://transchem-tech.com/Uploadfiles/files/ragiwubojukunajuzu.pdfIn PDF document text
- http://hotelbelleepoque.bg/userfiles/file/7331684271.pdfIn PDF document text
- https://mysmartedu.com/uploadimages/files/60963695190.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/75ac62bf07136585248ff0ad90ad0c22/jawetafosiwip.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7692931e36---98288821397.pdfIn PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/128afea4e03426be4f071976acfb36b8/39870361476.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=leukocytosis+and+leukopenia+arePDF 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_off0000e729.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE729	17456 bytes
SHA-256: `dff71fb3b0e26fb2075944a079738fd8d78de9efa6b3a747fa7fb089b97b026c`
`font_01_sfnt_off00011501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11501	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D18	10772 bytes
SHA-256: `f9a834dd8e8a531072b93849d0bee8bf49aa54ca626c6e90bacf456b8ed8fb0e`

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