PDF malware analysis — malicious · 638d1057f0ef49bc

MALICIOUS

PDF

85.6 KB Created: 2021-08-05 05:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: e94c0a0e754e429574cb989f107b1d51 SHA-1: e6699aada7cc8f90fee591e51f84f0e87ec169cb SHA-256: 638d1057f0ef49bc37227b28982be42117232cc4b41bc5fca9bd898ee17538c0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The file's structure and the presence of external links indicate it's likely part of a phishing campaign or an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://sammyuriasproperties.com/userfiles/files/gidikosuzus.pdf In PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/utubbh3pjg2sc9l60rel70mrin/34443527489.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9719ea803b92e0c24c23cf4bc40401df/laxugenoxerabuwul.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c7755053---wuvabajifupemobotivivebu.pdfIn PDF document text
- http://diplomat2014.ru/ckfinder/userfiles/files/3582486540.pdfIn PDF document text
- https://apc-algercentre.dz/ckfinder/userfiles/files/57215066673.pdfIn PDF document text
- http://skiflogistics.ru/userfiles/file/muxot.pdfIn PDF document text
- https://aulacvn.com/upload/fck/file/rumuvuzuxemuviz.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6c6643c9c93a07f325984321b476970c/letudemovegejufugigodena.pdfIn PDF document text
- https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/20fdde9300cde8f0d3c39c00f4c77d05/34751909324.pdfIn PDF document text
- http://atut-biuro.com/uploaded/file/57603319414.pdfIn PDF document text
- http://allg-gyn.ch/userfiles/file/tijulozosut.pdfIn PDF document text
- http://reicar.dk/userfiles/file/luteposedaveranasa.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d63cf9fa---19111448077.pdfIn PDF document text
- http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/41678146361.pdfIn PDF document text
- https://unibel.pl/pliki/upload/file/fopifomum.pdfIn PDF document text
- http://hondatayho.vn/images/ckeditor/files/48209026161.pdfIn PDF document text
- https://nisahanpin.com/calisma2/files/uploads/xapilalukinawefikesukatu.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8e7acea0abdf34cc893fab955144b2ec/34266515490.pdfIn PDF document text
- http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/zesewumopag.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bf1ab2e6tspfek4beh5gs0vum4/97316557278.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92223e66a---12732342220.pdfIn PDF document text
- http://dailyxedayhang.com/userfiles/files/63158299523.pdfIn PDF document text
- http://mellorymotors.ru/admin/ckfinder/userfiles/files/gaginajoj.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6c40fefb27cd660dced7edf830b865b/19015144651.pdfIn PDF document text
- https://smartcrm.cloud/upload/files/muridise.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+way+to+kill+haderax+the+invinciblePDF 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_off0000e9f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F7	17096 bytes
SHA-256: `715da61769b5587f738e69de2b8402dc11578d1d8c15a031d2a63b32e2a98017`
`font_01_sfnt_off0001167c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1167C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E93	11120 bytes
SHA-256: `3a3c7188858ab92d1840b9aaed1711f57524b0e3ba8a3ab7a401506f62adafcc`

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